636442 has 8 divisors (see below), whose sum is σ = 959616. Its totient is φ = 316572.

The previous prime is 636421. The next prime is 636469. The reversal of 636442 is 244636.

636442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

636442 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268 + ... + 1159.

It is an arithmetic number, because the mean of its divisors is an integer number (119952).

2⁶³⁶⁴⁴² is an apocalyptic number.

636442 is a deficient number, since it is larger than the sum of its proper divisors (323174).

636442 is a wasteful number, since it uses less digits than its factorization.

636442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652.

The product of its digits is 3456, while the sum is 25.

The square root of 636442 is about 797.7731507139. The cubic root of 636442 is about 86.0173932731.

The spelling of 636442 in words is "six hundred thirty-six thousand, four hundred forty-two".