400031313 has 32 divisors (see below), whose sum is σ = 593382912. Its totient is φ = 237686400.

The previous prime is 400031257. The next prime is 400031329. The reversal of 400031313 is 313130004.

It is not a de Polignac number, because 400031313 - 2⁸ = 400031057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400031292 and 400031301.

It is not an unprimeable number, because it can be changed into a prime (400031363) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 507906 + ... + 508692.

It is an arithmetic number, because the mean of its divisors is an integer number (18543216).

Almost surely, 2^400031313 is an apocalyptic number.

It is an amenable number.

400031313 is a deficient number, since it is larger than the sum of its proper divisors (193351599).

400031313 is a wasteful number, since it uses less digits than its factorization.

400031313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 400031313 is about 20000.7828096802. The cubic root of 400031313 is about 736.8255255728.

Adding to 400031313 its reverse (313130004), we get a palindrome (713161317).

The spelling of 400031313 in words is "four hundred million, thirty-one thousand, three hundred thirteen".