Properties of the Number 30990

Thirty Thousand Nine Hundred Ninety

Basics

Value: 30989 → 30990 → 30991

Parity: even

Prime: No

Previous Prime: 30983

Next Prime: 31013

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 5 × 1033

Divisors: 1, 2, 3, 5, 6, 10, 15, 30, 1033, 2066

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 111100100001110

Octal: 74416

Duodecimal: 15B26

Hexadecimal: 790e

Square: 960380100

Square Root: 176.0397682343396

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

G.f.: Im((2·i; x)_oo), where (a; q)_oo is the q-Pochhammer symbol, i = sqrt(-1). A292140

Number of rooted unlabeled trees on n nodes having a primary branch. A27415

a(n) = (n⁴ + 16·n³ + 65·n² + 26·n + 12)/12. A188480

7-automorphic numbers ending in 3: final digits of 7n² agree with n. A30990

G.f. satisfies: A(x) = 1 + ∑_n>=1 x^n-1*series_reversion( x/A(x)ⁿ ). A125224

Fermat pseudoprimes to base 2 divisible by 15. A216364

Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 4, 6 or 7 king-move adjacent elements, with upper left element zero. A306056