Properties of the Number -288420

Two Hundred Eighty-Eight Thousand Four Hundred Twenty

Basics

Value: -288421 → -288420 → -288419

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 2 ² × 3 × 5 × 11 × 19 × 23

Divisors: 1, 2, 3, 4, 5, 6, 10, 11, 12, 15

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: Yes

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1000110011010100100

Octal: -1063244

Duodecimal: -11AAB0

Hexadecimal: -466a4

Square: 83186096400

Square Root: 537.047483934149

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

a(n) = 12167n - 3588. A156846

Expansion of 1/((1-x)²*(1-x²)³*(1-x³)²*(1-x⁴)). A210068

Expansion of g.f. A(x) satisfying 2 = ∑_n=-oo..+oo (-1)ⁿ * x^2·n * (2·A(x) + x^n-2)ⁿ⁺¹. A363107

Triangular numbers with only even digits. A117978

Triangular numbers that are sandwiched between two semiprimes; or triangular numbers t such that t-1 and t+1 are both semiprime. A121898

Triangular numbers that are the product of three distinct triangular numbers greater than 1. A225440

Triangular arithmetic on half-squares: b(n)*(b(n) - 1)/2 where b(n) = floor(n²/2). A227970

Numbers k such that k² +- k +- 1 is prime for all four possibilities. A236056

Number of unordered pairs of distinct strict integer partitions of n. A366132

G.f. for Ehrhart quasi-polynomials for hyperplane arrangements of type E₇. A210633