Properties of the Number 7987

Seven Thousand Nine Hundred Eighty-Seven

Basics

Value: 7986 → 7987 → 7988

Parity: odd

Prime: No

Previous Prime: 7963

Next Prime: 7993

Digit Sum: 31

Digital Root: 4

Palindrome: No

Factorization: 7 ² × 163

Divisors: 1, 7, 49, 163, 1141, 7987

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111100110011

Octal: 17463

Duodecimal: 4757

Hexadecimal: 1f33

Square: 63792169

Square Root: 89.37001734362593

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 k such that 3^k - 34 is prime. A219051

Array T(n,k) = number of conjugacy classes of subgroups of index k in free group of rank n, read by antidiagonals. A57004

Triangle read by rows: T(n,k), n >=1, 0 <= k <= C(n,k), = number of n X n symmetric positive definite matrices with 2's on the main diagonal and 1's and 0's elsewhere and with k 1's above the diagonal. A80858

Numbers having exactly three representations by the quadratic form x²+xy+y² with 0<=x<=y. A198774

Numbers that are the sum of seven fourth powers in four or more ways. A345570

Numbers that are the sum of seven fourth powers in five or more ways. A345571

Numbers that are the sum of seven fourth powers in exactly five ways. A345827

Numbers whose smallest decimal digit is 7. A284068

T(n,k)=Equals two maps: number of nXk binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, vertical and antidiagonal neighbors in a random 0..1 nXk array. A220279

Number of nonempty subsets of {1..n} whose elements have an odd root mean square. A357415