Properties of the Number 72390

Seventy-Two Thousand Three Hundred Ninety

Basics

Value: 72389 → 72390 → 72391

Parity: even

Prime: No

Previous Prime: 72383

Next Prime: 72421

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 5 × 19 × 127

Divisors: 1, 2, 3, 5, 6, 10, 15, 19, 30, 38

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 10001101011000110

Octal: 215306

Duodecimal: 35A86

Hexadecimal: 11ac6

Square: 5240312100

Square Root: 269.05389794611784

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

a(n) = n*(n+1)*(n²+n+1)/2. A110450

Triangular numbers that are sandwiched between two semiprimes; or triangular numbers t such that t-1 and t+1 are both semiprime. A121898

Number of edges in the Hasse diagram of the poset of conjugacy classes of subgroups of the symmetric group. A218925

Integers m such that A342805(m) = m+3. A342806

Triangular numbers k*(k+1)/2 such that A068865(k) = k*(k+1)/2. A68866

Triangular numbers which are products of five distinct primes. A357590

Triangular numbers that are sandwiched between two squarefree semiprimes. A375384

G.f. A(x) satisfies: A(x)² - 2·A(x)³ = A(x²). A273095

Sum of two powers of 13. A72390