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Properties of the Number 31440

Thirty-One Thousand Four Hundred Forty

Basics

Value: 31439 → 31440 → 31441

Parity: even

Prime: No

Previous Prime: 31397

Next Prime: 31469

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 2 4 × 3 × 5 × 131

Divisors: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 111101011010000

Octal: 75320

Duodecimal: 16240

Hexadecimal: 7ad0

Square: 988473600

Square Root: 177.313282074412

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

Numbers n such that there exists an x≠n that makes {n,n,x} an amicable multiset. A259302
Partial sums of A002522, starting at n=1. A145066
a(n) = T(7,n), array T given by A048505. A48512
Abundant numbers n such that σ(σ(n) - 2·n) = σ(n). A292365
Numbers n such that 2·10n + 6·Rn + 3 is prime, where Rn = 11...1 is the repunit (A002275) of length n. A102957
Numbers n such that 9·10n-7 is prime. A103092
Expansion of d/dx arctan(x·A001003(x)). A187071
Molecular topological indices of the pan graphs. A192836
Number of 5 X n 0..1 arrays with new values 0..1 introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors. A208640
Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 1 3 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 1 3 6 or 7. A252299