400555131 has 24 divisors (see below), whose sum is σ = 565519824. Its totient is φ = 252149760.

The previous prime is 400555109. The next prime is 400555147. The reversal of 400555131 is 131555004.

It is not a de Polignac number, because 400555131 - 2²² = 396360827 is a prime.

It is a super-2 number, since 2×400555131² = 320888825940854322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400555151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 624571 + ... + 625211.

It is an arithmetic number, because the mean of its divisors is an integer number (23563326).

Almost surely, 2^400555131 is an apocalyptic number.

400555131 is a deficient number, since it is larger than the sum of its proper divisors (164964693).

400555131 is a wasteful number, since it uses less digits than its factorization.

400555131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1259 (or 1240 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 400555131 is about 20013.8734631755. The cubic root of 400555131 is about 737.1469955160.

The spelling of 400555131 in words is "four hundred million, five hundred fifty-five thousand, one hundred thirty-one".