Properties of the Number 18788

Eighteen Thousand Seven Hundred Eighty-Eight

Basics

Value: 18787 → 18788 → 18789

Parity: even

Prime: No

Previous Prime: 18787

Next Prime: 18793

Digit Sum: 32

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 7 × 11 × 61

Divisors: 1, 2, 4, 7, 11, 14, 22, 28, 44, 61

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100100101100100

Octal: 44544

Duodecimal: AA58

Hexadecimal: 4964

Square: 352988944

Square Root: 137.0693255254435

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 ways of writing n as the sum of 7 triangular numbers. A226252

Two-column table read by rows: Primitive distinct pairs that have the same value of φ, σ, and τ. A322688

Least b > p_n² such that [p₁²,p₂²,...,p_n²] in base b is prime, where p_j denotes the j-th prime. A224197

Number of partitions of n whose greatest part is a multiple of 4. A363046

Number of point-labeled reduced two-graphs with n nodes. A7833

Expansion of (η(q⁴) * η(q¹²) / (η(q) * η(q³)))² in powers of q. A123647

Numbers equal to the determinant of a circulant matrix based on the base-9 digits of n. A303369

Expansion of (η(q⁷) / η(q))⁴ in powers of q. A121593

G.f. A(x) satisfies A(x) = 1 + ∑_n>=1 A(x)ⁿ * x^2·n-1/(1 - x^2·n-1). A192400

Expansion of ∏_m>=1 (1-m·q^m)²⁸. A22688