402636 has 48 divisors (see below), whose sum is σ = 1058400. Its totient is φ = 118272.

The previous prime is 402631. The next prime is 402691. The reversal of 402636 is 636204.

402636 = 3² + 4² + ... + 106².

402636 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (402631) 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, 4480 + ... + 4568.

It is an arithmetic number, because the mean of its divisors is an integer number (22050).

2⁴⁰²⁶³⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (529200).

402636 is an abundant number, since it is smaller than the sum of its proper divisors (655764).

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

402636 is a wasteful number, since it uses less digits than its factorization.

402636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138 (or 136 counting only the distinct ones).

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

The square root of 402636 is about 634.5360509853. The cubic root of 402636 is about 73.8421275182.

The spelling of 402636 in words is "four hundred two thousand, six hundred thirty-six".