Number

1,397

1,397 is a composite number, odd, a calendar year.

1,397 (one thousand three hundred ninety-seven) is an odd 4-digit number. It is a composite number with 4 divisors, and factors as 11 × 127. Written other ways, in Roman numerals it is MCCCXCVII and in binary, 10101110101.

Arithmetic Number Binary Palindrome Cube-Free Deficient Number Odious Number Pernicious Number Recamán's Sequence Semiprime Squarefree Year

Interestingness

★ ★ ★ ★ ☆

6 notable facts · grade B

1,385 1,386 1,387 1,388 1,389 1,390 1,391 1,392 1,393 1,394 1,395 1,396 1,397 1,398 1,399 1,400 1,401 1,402 1,403 1,404 1,405 1,406 1,407 1,408 1,409

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Notable events — 1397 AD

Jun 17 The Kalmar Union unites Denmark, Norway, and Sweden under Margaret I.

Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0

Year facts

Year type: Common year
Standard 365-day year; not divisible by 4 (or divisible by 100 but not 400).
Days in year: 365
ISO weeks: 52
Started on: Sunday
January 1, 1397
Ended on: Sunday
December 31, 1397
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 1390s
1390–1399
Century: 14th century
1301–1400
Millennium: 2nd millennium
1001–2000
Years ago: 629
629 years before 2026.

In other calendars

Hebrew: 5157 / 5158 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 799 / 800 AH
Lunar calendar; year spans differ from Gregorian.
Chinese: Year of the zodiac:Fire zodiac:Ox
Sexagenary cycle position 14 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1940 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 775 / 776 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 1389 / 1390 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 1319 / 1318 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 4
Digit sum: 20
Digit product: 189
Digital root: 2
Palindrome: No
Bit width: 11 bits
Reversed: 7,931
Recamán's sequence: a(8,334) = 1,397
Square (n²): 1,951,609
Cube (n³): 2,726,397,773
Divisor count: 4
σ(n) — sum of divisors: 1,536
φ(n) — Euler's totient: 1,260
Sum of prime factors: 138

Primality

Prime factorization: 11 × 127

Nearest primes: 1,381 (−16) · 1,399 (+2)

Divisors & multiples

All divisors (4)

1 · 11 · 127 · 1397

Aliquot sum (sum of proper divisors): 139

Factor pairs (a × b = 1,397)

1 × 1397

11 × 127

First multiples

1,397 · 2,794 (double) · 4,191 · 5,588 · 6,985 · 8,382 · 9,779 · 11,176 · 12,573 · 13,970

Sums & aliquot sequence

As consecutive integers: 698 + 699 122 + 123 + … + 132 53 + 54 + … + 74

Aliquot sequence: 1,397 → 139 → 1 → 0 — terminates at zero

Continued fraction of √n

√1,397 = [37; (2, 1, 1, 1, 10, 18, 1, 1, 2, 6, 2, 1, 1, 18, 10, 1, 1, 1, 2, 74)]

Period length 20 — the block in parentheses repeats forever.

Representations

In words: one thousand three hundred ninety-seven
Ordinal: 1397th
Roman numeral: MCCCXCVII
Binary: 10101110101
Octal: 2565
Hexadecimal: 0x575
Base64: BXU=
One's complement: 64,138 (16-bit)
Scientific notation: 1.397 × 10³
As a duration: 1,397 s = 23 minutes, 17 seconds

In other bases

ternary (3) 1220202

quaternary (4) 111311

quinary (5) 21042

senary (6) 10245

septenary (7) 4034

nonary (9) 1822

undecimal (11) 1060

duodecimal (12) 985

tridecimal (13) 836

tetradecimal (14) 71b

pentadecimal (15) 632

Palindromic in base 2, base 16

As an angle

1,397° = 3 × 360° + 317°

317° ≈ 5.533 rad

Compass bearing: NW (northwest)

Why does a circle have 360 degrees? →

Historical numeral systems

Babylonian (base 60): 𒌋𒌋𒁹𒁹𒁹 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓆼𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): ͵ατϟζʹ
Mayan (base 20): 𝋣·𝋩·𝋱
Chinese: 一千三百九十七
Chinese (financial): 壹仟參佰玖拾柒

In other modern scripts

Eastern Arabic ١٣٩٧ Devanagari १३९७ Bengali ১৩৯৭ Tamil ௧௩௯௭ Thai ๑๓๙๗ Tibetan ༡༣༩༧ Khmer ១៣៩៧ Lao ໑໓໙໗ Burmese ၁၃၉၇

Digit at this position in famous constants

π — Pi (π): Digit 1,397 = 9
e — Euler's number (e): Digit 1,397 = 9
φ — Golden ratio (φ): Digit 1,397 = 8
√2 — Pythagoras's (√2): Digit 1,397 = 8
ln 2 — Natural log of 2: Digit 1,397 = 0
γ — Euler-Mascheroni (γ): Digit 1,397 = 6

Also seen as

Unicode codepoint

Armenian Small Letter Yi

U+0575

Lowercase letter (Ll)

UTF-8 encoding: D5 B5 (2 bytes).

Lookup U+0575 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000575

RGB(0, 5, 117)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.5.117.

Address: 0.0.5.117
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.5.117

Unspecified address (0.0.0.0/8) — "this network" placeholder.

Musical pitch

Heard as a frequency, 1,397 Hz is closest to:

Concert pitch (A4 = 440 Hz): F6 (1396.9 Hz, exact)
Scientific pitch (C4 = 256 Hz): F6 (1366.9 Hz, +38¢)
Baroque pitch (A4 = 415 Hz): F♯6 (1395.9 Hz, +1¢)

Position in π

The digit sequence 1397 first appears in π at position 17,160 of the decimal expansion (the 17,160ordinal-suffix:th digit after the integer 3).

Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.

Look up 1397 on Pi Search ↗