Properties of the Number 3945

Three Thousand Nine Hundred Forty-Five

Basics

Value: 3944 → 3945 → 3946

Parity: odd

Prime: No

Previous Prime: 3943

Next Prime: 3947

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 5 × 263

Divisors: 1, 3, 5, 15, 263, 789, 1315, 3945

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111101101001

Octal: 7551

Duodecimal: 2349

Hexadecimal: f69

Square: 15563025

Square Root: 62.80923498976882

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

11-gonal (or hendecagonal) numbers: a(n) = n*(9·n-7)/2. A51682

Number of primes < prime(n)². A879

Main diagonal of A277320: a(n) = A048720(n, A065621(n)). A277699

Number of labeled simple graphs covering n vertices with a unique undirected cycle of length > 2. A372195

Number of integer compositions of n with product n. A335405

a(n) = a(n-1) + a(m) for n >= 4, where m = 2^p+1 + 2 - n and p is the unique integer such that 2^p < n - 1 <= 2^p+1, starting with a(1) = 1 and a(2) = a(3) = 3. A50065

Numbers k with exactly three distinct prime factors and such that cototient(k) is a square. A306670

Sequence is {a(7,n)}, where a(m,n) is defined in sequence A110665. A110672

Handsome numbers (A007532) representable as a sum of any positive powers of their digits in two distinct ways, not counting different powers of duplicated digits as distinct. A50240

Reversion of g.f. (with constant term included) for partition numbers. A66398