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Properties of the Number -139128

One Hundred Thirty-Nine Thousand One Hundred Twenty-Eight

Basics

Value: -139129 → -139128 → -139127

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 2 3 × 3 × 11 × 17 × 31

Divisors: 1, 2, 3, 4, 6, 8, 11, 12, 17, 22

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: Yes

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: -100001111101111000

Octal: -417570

Duodecimal: -68620

Hexadecimal: -21f78

Square: 19356600384

Square Root: 372.99865951501755

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

Tritriangular numbers: a(n) = binomial(binomial(n,2),2) = n*(n+1)*(n-1)*(n-2)/8. A50534
Solution to a Diophantine equation: each term is a triangular number and each term + 1 is a square. A6454
Alkane (or paraffin) numbers l(8,n). A5995
Number of reversible strings with n-1 beads of 2 colors. 5 beads are black. String is not palindromic. A32092
Triangular numbers that are eight times another triangular number. A336626
One half of binomial coefficients C(2·n-4,5). A53132
Ulam numbers such that 2·n is also an Ulam number. A68791
a(n) = 279841n2 - 165048n + 24335. A156843
Triangular numbers that differ from a square by 1. A182334
Let p = n-th prime of the form 4k+3, take smallest solution (x,y) to the Pellian equation x2 - p·y2 = 1 with·and y >= 1; sequence gives value of x. A81231