Properties of the Number 1939

One Thousand Nine Hundred Thirty-Nine

Basics

Value: 1938 → 1939 → 1940

Parity: odd

Prime: No

Previous Prime: 1933

Next Prime: 1949

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 7 × 277

Divisors: 1, 7, 277, 1939

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11110010011

Octal: 3623

Duodecimal: 1157

Hexadecimal: 793

Square: 3759721

Square Root: 44.034077712607996

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

a(n) = n² + 3. A117950

Numbers n such that 97 is the largest prime factor of n² - 1. A181470

Number of integer partitions of n such that the maximum is twice the median. A361849

Numbers where 9 outnumbers any other digit. A292449

Numbers which yield a prime whenever a 1 is inserted anywhere in them (including at the beginning or end). A68679

a(1) = a(2) = a(3) = a(4) = a(5) = 1 and for n>5: a(n) = a(n-4) + a(n-5). A103372

Trajectory of 40 under the map n-> A006369(n). A217729

Sorted positions of first appearances in A057820, the sequence of first differences of prime-powers. A376340

T(n,k)=Number of length n 0..k arrays with each partial sum starting from the beginning no more than sqrt(3) standard deviations from its mean. A244940

Number of cycles of n-digit numbers (including fixed points) under the Kaprekar map A151949. A164731