408521868 has 24 divisors (see below), whose sum is σ = 976468080. Its totient is φ = 132852480.

The previous prime is 408521821. The next prime is 408521947. The reversal of 408521868 is 868125804.

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, 414673 + ... + 415656.

It is an arithmetic number, because the mean of its divisors is an integer number (40686170).

Almost surely, 2^408521868 is an apocalyptic number.

It is an amenable number.

408521868 is an abundant number, since it is smaller than the sum of its proper divisors (567946212).

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

408521868 is a wasteful number, since it uses less digits than its factorization.

408521868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830377 (or 830375 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 42.

The square root of 408521868 is about 20211.9239064469. The cubic root of 408521868 is about 742.0020463807.

The spelling of 408521868 in words is "four hundred eight million, five hundred twenty-one thousand, eight hundred sixty-eight".