663426 has 12 divisors (see below), whose sum is σ = 1437462. Its totient is φ = 221136.

The previous prime is 663409. The next prime is 663437. The reversal of 663426 is 624366.

663426 is a `hidden beast` number, since 6 + 634 + 26 = 666.

663426 is an esthetic number in base 7, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in only one way, i.e., 540225 + 123201 = 735^2 + 351^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 663426.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18411 + ... + 18446.

2⁶⁶³⁴²⁶ is an apocalyptic number.

663426 is an abundant number, since it is smaller than the sum of its proper divisors (774036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

663426 is a wasteful number, since it uses less digits than its factorization.

663426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36865 (or 36862 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

The square root of 663426 is about 814.5096684509. The cubic root of 663426 is about 87.2162673408.

Subtracting from 663426 its reverse (624366), we obtain a triangular number (39060 = T₂₇₉).

It can be divided in two parts, 663 and 426, that added together give a square (1089 = 33²).

The spelling of 663426 in words is "six hundred sixty-three thousand, four hundred twenty-six".