Properties of the Number 3969

Three Thousand Nine Hundred Sixty-Nine

Basics

Value: 3968 → 3969 → 3970

Parity: odd

Prime: No

Previous Prime: 3967

Next Prime: 3989

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ⁴ × 7 ²

Divisors: 1, 3, 7, 9, 21, 27, 49, 63, 81, 147

Polygonal

Triangular: No

Square: Yes

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111110000001

Octal: 7601

Duodecimal: 2369

Hexadecimal: f81

Square: 15752961

Square Root: 63

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

Odd squares: a(n) = (2n+1)². Also centered octagonal numbers. A16754

Perfect powers of nonprimes (m^k where m is a nonprime positive integer and k >= 2). A131605

Numbers n such that A048767(n) = n. A48768

Number of twice-partitions of type (Q,P,Q) and weight n. A279790

a(n) = (2ⁿ - 1)². A60867

Product of the proper divisors of n. A7956

The non-repetitive Kaprekar binary numbers in decimal. A163205

a(n) = σ(n)². A72861

Numerators of coefficients of EllipticK/π. A38534

Primal codes of finite permutations on positive integers. A109297