1,938
1,938 is a composite number, even, a calendar year.
1,938 (one thousand nine hundred thirty-eight) is an even 4-digit number. It is a composite number with 16 divisors, and factors as 2 × 3 × 17 × 19. Its proper divisors sum to 2,382, more than the number itself, making it an abundant number. Written other ways, in Roman numerals it is MCMXXXVIII and in binary, 11110010010.
Interestingness
Notable events — 1938 AD
- Mar 12 Nazi Germany annexes Austria in the Anschluss.
- Sep 30 The Munich Agreement cedes Czechoslovakia's Sudetenland to Germany.
- Oct 30 Orson Welles's War of the Worlds radio broadcast causes panic.
- Nov 9 Kristallnacht: organized Nazi violence destroys Jewish businesses and synagogues across Germany.
- Dec 27 Nuclear fission is reported by Hahn and Strassmann in Berlin.
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
-
Saturday
January 1, 1938
- Ended on
-
Saturday
December 31, 1938
- Friday the 13ths
-
1
One Friday the 13th this year.
- Easter Sunday
-
April 17
Sunday, April 17, 1938
- Decade
-
1930s
1930–1939
- Century
-
20th century
1901–2000
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
88
88 years before 2026.
- FIFA World Cup
-
Yes
Men's FIFA World Cup is held every four years (skipped 1942 and 1946 due to WWII).
In other calendars
- Hebrew
-
5698 / 5699 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1356 / 1357 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Earth zodiac:Tiger
Sexagenary cycle position 15 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2481 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1316 / 1317 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1930 / 1931 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1860 / 1859 Saka
Indian national calendar; year starts in March.
- Japanese
-
Shōwa 13
Reign-era counting from the start of each emperor's reign.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 21
- Digit product
- 216
- Digital root
- 3
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 8,391
- Recamán's sequence
- a(519) = 1,938
- Square (n²)
- 3,755,844
- Cube (n³)
- 7,278,825,672
- Divisor count
- 16
- σ(n) — sum of divisors
- 4,320
- φ(n) — Euler's totient
- 576
- Sum of prime factors
- 41
Primality
Prime factorization: 2 × 3 × 17 × 19
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√1,938 = [44; (44, 88)]
Period length 2 — the block in parentheses repeats forever.
Representations
- In words
- one thousand nine hundred thirty-eight
- Ordinal
- 1938th
- Roman numeral
- MCMXXXVIII
- Binary
- 11110010010
- Octal
- 3622
- Hexadecimal
- 0x792
- Base64
- B5I=
- One's complement
- 63,597 (16-bit)
- Scientific notation
- 1.938 × 10³
- As a duration
- 1,938 s = 32 minutes, 18 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵αϡληʹ
- Mayan (base 20)
- 𝋤·𝋰·𝋲
- Chinese
- 一千九百三十八
- Chinese (financial)
- 壹仟玖佰參拾捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,938 = 5
- e — Euler's number (e)
- Digit 1,938 = 8
- φ — Golden ratio (φ)
- Digit 1,938 = 0
- √2 — Pythagoras's (√2)
- Digit 1,938 = 7
- ln 2 — Natural log of 2
- Digit 1,938 = 9
- γ — Euler-Mascheroni (γ)
- Digit 1,938 = 3
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1938, here are decompositions:
- 5 + 1933 = 1938
- 7 + 1931 = 1938
- 31 + 1907 = 1938
- 37 + 1901 = 1938
- 59 + 1879 = 1938
- 61 + 1877 = 1938
- 67 + 1871 = 1938
- 71 + 1867 = 1938
Showing the first eight; more decompositions exist.
UTF-8 encoding: DE 92 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.146.
- Address
- 0.0.7.146
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.7.146
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 1,938 Hz is closest to:
- Concert pitch (A4 = 440 Hz): B6 (1975.5 Hz, -33¢)
- Scientific pitch (C4 = 256 Hz): B6 (1933.1 Hz, +4¢)
- Baroque pitch (A4 = 415 Hz): C7 (1974.1 Hz, -32¢)
The digit sequence 1938 first appears in π at position 168 of the decimal expansion (the 168ordinal-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.
Related reading
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.