Properties of the Number -405769

Four Hundred Five Thousand Seven Hundred Sixty-Nine

Basics

Value: -405770 → -405769 → -405768

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 31

Digital Root: 4

Palindrome: No

Factorization: 7 ⁴ × 13 ²

Divisors: 1, 7, 13, 49, 91, 169, 343, 637, 1183, 2401

Polygonal

Triangular: No

Square: Yes

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: -1100011000100001001

Octal: -1430411

Duodecimal: -1769A1

Hexadecimal: -63109

Square: 164648481361

Square Root: 637

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

Numbers of the form (7ⁱ)*(13^j). A108056

Smallest k such that circle centered at the origin and with radius sqrt(k) passes through exactly 6·n integer points in the hexagonal lattice (see A004016). A343771

Squares that are the sum of 3 consecutive primes. A80665

Smallest nonnegative number k such that k can be written in exactly n ways as x² + xy + y² where·and y are positive integers, with x >= y. A300419

Squares whose external digits (MSD and LSD) as well as internal digits form squares. A77357

Fixed points of A153212: After a(1) = 1, numbers of the form p_i1ⁱ¹ * p_i2^i2-i1 * p_i3^i3-i2 * ... * p_ik^ik-i_k-1, where p_i's are distinct primes present in the prime factorization of n, with i1 < i2 < i3 < ... < ik, and k = A001221(n) and ik = A061395(n). A242421

Squares whose internal digits form a square. A77355

a(n) = (15·n⁴ + 22·n³ + 45·n² + 14·n) / 24. A101166

Numbers of the form (q1^b1)(q2^b2)(q3^b3)(q4^b4)(q5^b5)... where q1=7, q2=13, q3=19, q4=31, q5=37, ... (A002476) and b1>=b2>=b3>=b4>=b5... A344473

a(n) is the smallest nonnegative integer k where there are exactly n solutions to x² + x·y + y² = k with 0 < x < y. A374094