Properties of the Number 18977

Eighteen Thousand Nine Hundred Seventy-Seven

Basics

Value: 18976 → 18977 → 18978

Parity: odd

Prime: No

Previous Prime: 18973

Next Prime: 18979

Digit Sum: 32

Digital Root: 5

Palindrome: No

Factorization: 7 × 2711

Divisors: 1, 7, 2711, 18977

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100101000100001

Octal: 45041

Duodecimal: AB95

Hexadecimal: 4a21

Square: 360126529

Square Root: 137.75703248836336

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 compositions of n with runs-resistance 2. A329745

Denominators of convergents to π by Farey fractions. A63673

Fundamental discriminants d uniquely characterizing all complex biquadratic fields Q(sqrt(-3),sqrt(d)) which have 3-class group of type (3,3) and second 3-class group isomorphic to SmallGroup(729,95). A250239

Numbers m such that A338038(m) = A338038(A004086(m)) where A004086(i) is i read backwards and A338038(i) is the sum of the primes and exponents in the prime factorization of i ignoring 1-exponents; palindromes and multiples of 10 are excluded. A338039

Triangle read by rows: T(n,k) is the number of rooted ordered trees with node weights summing to n, where the root has weight 0, all internal nodes have weight 1, and leaf nodes have weights in {1,...,k}. A384685

a(n) = greatest k such that A155043(k+A262509(n)) < A155043(A262509(n)). A262909

Number of permutations of 1..n with displacements restricted to {-4,-3,0,1,2}. A189581

Non-palindromic n and its digit reversal have the same sum of prime factors (with repetition). A85607

Number of active (ON, black) cells at stage 2ⁿ-1 of the two-dimensional cellular automaton defined by "Rule 406", based on the 5-celled von Neumann neighborhood. A271887

Total number of fixed points in free homeomorphically irreducible trees with n nodes. A37246