402021636 has 24 divisors (see below), whose sum is σ = 939264480. Its totient is φ = 133833792.

The previous prime is 402021629. The next prime is 402021673. The reversal of 402021636 is 636120204.

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, 11841 + ... + 30728.

It is an arithmetic number, because the mean of its divisors is an integer number (39136020).

Almost surely, 2^402021636 is an apocalyptic number.

It is an amenable number.

402021636 is an abundant number, since it is smaller than the sum of its proper divisors (537242844).

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

402021636 is a wasteful number, since it uses less digits than its factorization.

402021636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43363 (or 43361 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 402021636 is about 20050.4772013037. The cubic root of 402021636 is about 738.0455094915.

The spelling of 402021636 in words is "four hundred two million, twenty-one thousand, six hundred thirty-six".