400187072 has 28 divisors (see below), whose sum is σ = 840836520. Its totient is φ = 188322816.

The previous prime is 400187071. The next prime is 400187077. The reversal of 400187072 is 270781004.

It is not an unprimeable number, because it can be changed into a prime (400187071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182822 + ... + 184997.

Almost surely, 2^400187072 is an apocalyptic number.

It is an amenable number.

400187072 is an abundant number, since it is smaller than the sum of its proper divisors (440649448).

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

400187072 is a wasteful number, since it uses less digits than its factorization.

400187072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367848 (or 367838 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 400187072 is about 20004.6762533164. The cubic root of 400187072 is about 736.9211450164.

The spelling of 400187072 in words is "four hundred million, one hundred eighty-seven thousand, seventy-two".