Properties of the Number 30978

Thirty Thousand Nine Hundred Seventy-Eight

Basics

Value: 30977 → 30978 → 30979

Parity: even

Prime: No

Previous Prime: 30977

Next Prime: 30983

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ² × 1721

Divisors: 1, 2, 3, 6, 9, 18, 1721, 3442, 5163, 10326

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111100100000010

Octal: 74402

Duodecimal: 15B16

Hexadecimal: 7902

Square: 959636484

Square Root: 176.00568172647155

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

Arises in enumerating Huffman codes, compact trees, and sums of unit fractions. A194629

a(n) = (9·n⁴ + 4·n³ - n)/2. A47786

Sums of two or more distinct 4th powers of primes. A130833

Expansion of 1 / ( (1-3·x) * (1-6·x) )^2/3. A383937

s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = A000201 (lower Wythoff sequence), t = A001950 (upper Wythoff sequence). A24686

s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = A000201 (lower Wythoff sequence), t = A001950 (upper Wythoff sequence). A25119

Numbers of the form k² + 2 that are the sums of two squares. A329170

Maximal number of non-attacking knights on an n X n board. A30978