636402 has 32 divisors (see below), whose sum is σ = 1411200. Its totient is φ = 190080.

The previous prime is 636359. The next prime is 636403. The reversal of 636402 is 204636.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 636402.

It is not an unprimeable number, because it can be changed into a prime (636403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3099 + ... + 3297.

It is an arithmetic number, because the mean of its divisors is an integer number (44100).

2⁶³⁶⁴⁰² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 636402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (705600).

636402 is an abundant number, since it is smaller than the sum of its proper divisors (774798).

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

636402 is a wasteful number, since it uses less digits than its factorization.

636402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 636402 is about 797.7480805367. The cubic root of 636402 is about 86.0155911880.

The spelling of 636402 in words is "six hundred thirty-six thousand, four hundred two".