400942869831 has 24 divisors (see below), whose sum is σ = 661937481504. Its totient is φ = 229088217600.

The previous prime is 400942869827. The next prime is 400942869851. The reversal of 400942869831 is 138968249004.

400942869831 is a `hidden beast` number, since 400 + 9 + 42 + 86 + 98 + 31 = 666.

It is not a de Polignac number, because 400942869831 - 2² = 400942869827 is a prime.

It is a super-2 number, since 2×400942869831² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400942869851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 367695 + ... + 968031.

It is an arithmetic number, because the mean of its divisors is an integer number (27580728396).

Almost surely, 2^400942869831 is an apocalyptic number.

400942869831 is a deficient number, since it is larger than the sum of its proper divisors (260994611673).

400942869831 is a wasteful number, since it uses less digits than its factorization.

400942869831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610951 (or 610948 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The spelling of 400942869831 in words is "four hundred billion, nine hundred forty-two million, eight hundred sixty-nine thousand, eight hundred thirty-one".