400808172 has 12 divisors (see below), whose sum is σ = 935219096. Its totient is φ = 133602720.

The previous prime is 400808147. The next prime is 400808227. The reversal of 400808172 is 271808004.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

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, 16700329 + ... + 16700352.

Almost surely, 2^400808172 is an apocalyptic number.

It is an amenable number.

400808172 is an abundant number, since it is smaller than the sum of its proper divisors (534410924).

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

400808172 is a wasteful number, since it uses less digits than its factorization.

400808172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33400688 (or 33400686 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 400808172 is about 20020.1941049531. The cubic root of 400808172 is about 737.3021877596.

The spelling of 400808172 in words is "four hundred million, eight hundred eight thousand, one hundred seventy-two".