400643313 has 16 divisors (see below), whose sum is σ = 610786176. Its totient is φ = 228833280.

The previous prime is 400643297. The next prime is 400643357. The reversal of 400643313 is 313346004.

It is not a de Polignac number, because 400643313 - 2⁴ = 400643297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (400643413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77745 + ... + 82737.

It is an arithmetic number, because the mean of its divisors is an integer number (38174136).

Almost surely, 2^400643313 is an apocalyptic number.

It is an amenable number.

400643313 is a deficient number, since it is larger than the sum of its proper divisors (210142863).

400643313 is a wasteful number, since it uses less digits than its factorization.

400643313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8824.

The product of its (nonzero) digits is 2592, while the sum is 24.

The square root of 400643313 is about 20016.0763637632. The cubic root of 400643313 is about 737.2010857204.

Adding to 400643313 its reverse (313346004), we get a palindrome (713989317).

The spelling of 400643313 in words is "four hundred million, six hundred forty-three thousand, three hundred thirteen".