400881 has 16 divisors (see below), whose sum is σ = 607040. Its totient is φ = 233280.

The previous prime is 400871. The next prime is 400903. The reversal of 400881 is 188004.

It is not a de Polignac number, because 400881 - 2⁵ = 400849 is a prime.

It is a super-2 number, since 2×400881² = 321411152322, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 400881.

It is not an unprimeable number, because it can be changed into a prime (400871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 471 + ... + 1011.

It is an arithmetic number, because the mean of its divisors is an integer number (37940).

2⁴⁰⁰⁸⁸¹ is an apocalyptic number.

It is an amenable number.

400881 is a deficient number, since it is larger than the sum of its proper divisors (206159).

400881 is a wasteful number, since it uses less digits than its factorization.

400881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 400881 is about 633.1516406044. The cubic root of 400881 is about 73.7346841699.

Adding to 400881 its reverse (188004), we get a palindrome (588885).

The spelling of 400881 in words is "four hundred thousand, eight hundred eighty-one".