Properties of the Number 39621

Thirty-Nine Thousand Six Hundred Twenty-One

Basics

Value: 39620 → 39621 → 39622

Parity: odd

Prime: No

Previous Prime: 39619

Next Prime: 39623

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 47 × 281

Divisors: 1, 3, 47, 141, 281, 843, 13207, 39621

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: Yes

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1001101011000101

Octal: 115305

Duodecimal: 1AB19

Hexadecimal: 9ac5

Square: 1569823641

Square Root: 199.0502449131877

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 2^k - 21 is prime. A96820

Triangular numbers which have one or more occurrences of exactly five different digits. A241788

Irregular table read by rows: n-th row lists the 9 n-gonal numbers of a 3 X 3 semimagic square with the smallest magic sum. The terms of each row are arranged in the manner shown in A261816. A265141

Triangular numbers t which are average of two consecutive primes p and p+4. A129752

Triangular numbers t such that t+10 is a prime. A129755

A continued fraction. A1112

Odd triangular numbers with prime indices. A34954

Triangular numbers with sum of digits = 21. A68131

Triangle read by rows in which the n-th row contains the n smallest triangular numbers with the least significant digits of the n-th triangular number. A95225

Diagonal of the triangle A095225. A95226