402021658 has 8 divisors (see below), whose sum is σ = 611293428. Its totient is φ = 198257184.

The previous prime is 402021629. The next prime is 402021673. The reversal of 402021658 is 856120204.

It can be written as a sum of positive squares in 2 ways, for example, as 401321089 + 700569 = 20033^2 + 837^2 .

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, 1376641 + ... + 1376932.

Almost surely, 2^402021658 is an apocalyptic number.

402021658 is a deficient number, since it is larger than the sum of its proper divisors (209271770).

402021658 is a wasteful number, since it uses less digits than its factorization.

402021658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2753648.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 402021658 is about 20050.4777499191. The cubic root of 402021658 is about 738.0455229543.

The spelling of 402021658 in words is "four hundred two million, twenty-one thousand, six hundred fifty-eight".