402532638 has 16 divisors (see below), whose sum is σ = 805959936. Its totient is φ = 134028440.

The previous prime is 402532619. The next prime is 402532649. The reversal of 402532638 is 836235204.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 402532599 and 402532608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31356 + ... + 42287.

It is an arithmetic number, because the mean of its divisors is an integer number (50372496).

Almost surely, 2^402532638 is an apocalyptic number.

402532638 is an abundant number, since it is smaller than the sum of its proper divisors (403427298).

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

402532638 is a wasteful number, since it uses less digits than its factorization.

402532638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74559.

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 402532638 is about 20063.2160432967. The cubic root of 402532638 is about 738.3580822633.

It can be divided in two parts, 4025 and 32638, that added together give a palindrome (36663).

The spelling of 402532638 in words is "four hundred two million, five hundred thirty-two thousand, six hundred thirty-eight".