Properties of the Number 12138

Twelve Thousand One Hundred Thirty-Eight

Basics

Value: 12137 → 12138 → 12139

Parity: even

Prime: No

Previous Prime: 12119

Next Prime: 12143

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 2 × 3 × 7 × 17 ²

Divisors: 1, 2, 3, 6, 7, 14, 17, 21, 34, 42

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 10111101101010

Octal: 27552

Duodecimal: 7036

Hexadecimal: 2f6a

Square: 147331044

Square Root: 110.17259187293362

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

Number of numbers whose base-3/2 expansion (see A024629) has n digits. A81848

a(n) = floor(a(n-1)*3/2) with a(1) = 2. A61418

Triangle read by rows: T(n,k) = T(n-1,k-1) + k²*T(n-1,k), 1 < k <= n, T(n,1) = 1. A36969

Triangle T(n,k) (0 <= k <= n) giving number of chains of length k in partially ordered set formed from subsets of n-set by inclusion. A38719

a(n) = n*(31·n-1)/2. A22288

Triangle read by rows. Stirling set numbers of order 2, T(n, n) = 1, T(n, k) = 0 if k < 0 or k > n, otherwise T(n, k) = T(n-1, k-1) + k²*T(n-1, k), for 0 <= k <= n. A269945

Triangle of central factorial numbers T(2·n,2·n-2·k), k >= 0, n >= 1 (in Riordan's notation). A8957

A diagonal of A036969. A60493

Numbers k such that k | sigma₈(k). A55712

Second differences of seventh powers (A001015). A255177