Properties of the Number 722

Seven Hundred Twenty-Two

Basics

Value: 721 → 722 → 723

Parity: even

Prime: No

Previous Prime: 719

Next Prime: 727

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 2 × 19 ²

Divisors: 1, 2, 19, 38, 361, 722

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1011010010

Octal: 1322

Duodecimal: 502

Hexadecimal: 2d2

Square: 521284

Square Root: 26.870057685088806

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

List of totally balanced sequences of 2n binary digits written in base 10. Binary expansion of each term contains n 0's and n 1's and reading from left to right (the most significant to the least significant bit), the number of 0's never exceeds the number of 1's. A14486

a(n) = 2·n². A1105

Squares and twice squares. A28982

Triangle read by rows: Eulerian numbers of type B, T(n,k) (1 <= k <= n) given by T(n, 1) = T(n,n) = 1, otherwise T(n, k) = (2·n - 2·k + 1)*T(n-1, k-1) + (2·k - 1)*T(n-1, k). A60187

a(n) = ceiling(n²/2). A982

a(n) = floor(n²/2). A7590

Number of strict integer partitions of n containing the sum of some subset of the parts. A variation of sum-full strict partitions. A364272

Number of partitions with no even part repeated; partitions of n in which no parts are multiples of 4. A1935

G.f.: ∏_k>=1 (1 + x^{2·k - 1}) / (1 - x^2·k). A6950

a(0) = 1, a(n) = 5·n² + 2 for n>0. A10001