Properties of the Number -1640625

Six Hundred Forty Thousand Six Hundred Twenty-Five

Basics

Value: -1640626 → -1640625 → -1640624

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 5 ⁷ × 7

Divisors: 1, 3, 5, 7, 15, 21, 25, 35, 75, 105

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -110010000100010110001

Octal: -6204261

Duodecimal: -671529

Hexadecimal: -1908b1

Square: 2691650390625

Square Root: 1280.8688457449498

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

Triangle read by rows: T(n,k) = (-1)^n-k*binomial(n, k)*(k+3)ⁿ, for n >= 0, and k = 0,1, ..., n. Coefficients of certain Sidi polynomials. A362353

Triangle read by rows, T(n,k) = (-1)^n-k*C(n,k)*kⁿ, for n >= 0 and 0 <= k <= n. A258773

Number of permutations of n elements divided by the number of quaternary heaps on n+1 elements. A273732

A sequence showing denominators in ratios tending to the constant π/4 = 0.785398163397448... . A278364

Triangle whose (i,j)-th entry is binomial(i,j)*5^i-j*5^j. A38247

Triangle T(n, k) = binomial(n, k)*A000166(n-k)*kⁿ with T(0, 0) = 1, read by rows. A156788

Composite integers m such that the sum of the integers x <= m not coprime to m ends with digits of m. A239245

Records in A378865. A379673