400872 has 16 divisors (see below), whose sum is σ = 1002240. Its totient is φ = 133616.

The previous prime is 400871. The next prime is 400903. The reversal of 400872 is 278004.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (400871) 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, 8328 + ... + 8375.

It is an arithmetic number, because the mean of its divisors is an integer number (62640).

2⁴⁰⁰⁸⁷² is an apocalyptic number.

It is an amenable number.

400872 is an abundant number, since it is smaller than the sum of its proper divisors (601368).

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

400872 is a wasteful number, since it uses less digits than its factorization.

400872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16712 (or 16708 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 400872 is about 633.1445332624. The cubic root of 400872 is about 73.7341323710.

Adding to 400872 its reverse (278004), we get a palindrome (678876).

The spelling of 400872 in words is "four hundred thousand, eight hundred seventy-two".