636489 has 12 divisors (see below), whose sum is σ = 1050816. Its totient is φ = 363672.

The previous prime is 636473. The next prime is 636499. The reversal of 636489 is 984636.

636489 is a `hidden beast` number, since 6 + 3 + 648 + 9 = 666.

636489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 636489 - 2⁴ = 636473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (636409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4989 + ... + 5114.

It is an arithmetic number, because the mean of its divisors is an integer number (87568).

2⁶³⁶⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

636489 is a deficient number, since it is larger than the sum of its proper divisors (414327).

636489 is a wasteful number, since it uses less digits than its factorization.

636489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10116 (or 10113 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 636489 is about 797.8026071655. The cubic root of 636489 is about 86.0195106265.

The spelling of 636489 in words is "six hundred thirty-six thousand, four hundred eighty-nine".