400310431 has 4 divisors (see below), whose sum is σ = 407863512. Its totient is φ = 392757352.

The previous prime is 400310419. The next prime is 400310473. The reversal of 400310431 is 134013004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 400310431 - 2⁷ = 400310303 is a prime.

It is a super-2 number, since 2×400310431² = 320496882334811522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400310231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3776461 + ... + 3776566.

It is an arithmetic number, because the mean of its divisors is an integer number (101965878).

Almost surely, 2^400310431 is an apocalyptic number.

400310431 is a deficient number, since it is larger than the sum of its proper divisors (7553081).

400310431 is an equidigital number, since it uses as much as digits as its factorization.

400310431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7553080.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 400310431 is about 20007.7592698433. The cubic root of 400310431 is about 736.9968567046.

Adding to 400310431 its reverse (134013004), we get a palindrome (534323435).

The spelling of 400310431 in words is "four hundred million, three hundred ten thousand, four hundred thirty-one".