636842 has 8 divisors (see below), whose sum is σ = 1005600. Its totient is φ = 301644.

The previous prime is 636829. The next prime is 636851. The reversal of 636842 is 248636.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8342 + ... + 8417.

It is an arithmetic number, because the mean of its divisors is an integer number (125700).

2⁶³⁶⁸⁴² is an apocalyptic number.

636842 is a deficient number, since it is larger than the sum of its proper divisors (368758).

636842 is a wasteful number, since it uses less digits than its factorization.

636842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16780.

The product of its digits is 6912, while the sum is 29.

The square root of 636842 is about 798.0238091686. The cubic root of 636842 is about 86.0354099720.

The spelling of 636842 in words is "six hundred thirty-six thousand, eight hundred forty-two".