400931 has 2 divisors, whose sum is σ = 400932. Its totient is φ = 400930.

The previous prime is 400927. The next prime is 400943. The reversal of 400931 is 139004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400931 - 2² = 400927 is a prime.

It is a super-2 number, since 2×400931² = 321491333522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (400031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200465 + 200466.

It is an arithmetic number, because the mean of its divisors is an integer number (200466).

2⁴⁰⁰⁹³¹ is an apocalyptic number.

400931 is a deficient number, since it is larger than the sum of its proper divisors (1).

400931 is an equidigital number, since it uses as much as digits as its factorization.

400931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 400931 is about 633.1911243850. The cubic root of 400931 is about 73.7377495692.

Adding to 400931 its reverse (139004), we get a palindrome (539935).

It can be divided in two parts, 400 and 931, that added together give a palindrome (1331).

The spelling of 400931 in words is "four hundred thousand, nine hundred thirty-one".