400310231 has 2 divisors, whose sum is σ = 400310232. Its totient is φ = 400310230.

The previous prime is 400310227. The next prime is 400310291. The reversal of 400310231 is 132013004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400310231 - 2² = 400310227 is a prime.

It is a super-2 number, since 2×400310231² = 320496562086546722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400310201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200155115 + 200155116.

It is an arithmetic number, because the mean of its divisors is an integer number (200155116).

Almost surely, 2^400310231 is an apocalyptic number.

400310231 is a deficient number, since it is larger than the sum of its proper divisors (1).

400310231 is an equidigital number, since it uses as much as digits as its factorization.

400310231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 400310231 is about 20007.7542717817. The cubic root of 400310231 is about 736.9967339670.

Adding to 400310231 its reverse (132013004), we get a palindrome (532323235).

The spelling of 400310231 in words is "four hundred million, three hundred ten thousand, two hundred thirty-one".