400988 has 12 divisors (see below), whose sum is σ = 802032. Its totient is φ = 171840.

The previous prime is 400963. The next prime is 400997. The reversal of 400988 is 889004.

400988 is an admirable number.

It is a super-2 number, since 2×400988² = 321582752288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 400988.

It is a congruent number.

It is an unprimeable number.

400988 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7133 + ... + 7188.

It is an arithmetic number, because the mean of its divisors is an integer number (66836).

2⁴⁰⁰⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

400988 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

400988 is a wasteful number, since it uses less digits than its factorization.

400988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14332 (or 14330 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 400988 is about 633.2361328920. The cubic root of 400988 is about 73.7412438134.

The spelling of 400988 in words is "four hundred thousand, nine hundred eighty-eight".