400312331 has 8 divisors (see below), whose sum is σ = 416886144. Its totient is φ = 383967360.

The previous prime is 400312313. The next prime is 400312421. The reversal of 400312331 is 133213004.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400312331 - 2⁶ = 400312267 is a prime.

It is a super-2 number, since 2×400312331² = 320499924701307122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400314331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53636 + ... + 60641.

It is an arithmetic number, because the mean of its divisors is an integer number (52110768).

Almost surely, 2^400312331 is an apocalyptic number.

400312331 is a deficient number, since it is larger than the sum of its proper divisors (16573813).

400312331 is a wasteful number, since it uses less digits than its factorization.

400312331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114421.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 400312331 is about 20007.8067513658. The cubic root of 400312331 is about 736.9980227095.

Adding to 400312331 its reverse (133213004), we get a palindrome (533525335).

The spelling of 400312331 in words is "four hundred million, three hundred twelve thousand, three hundred thirty-one".