400344313 has 4 divisors (see below), whose sum is σ = 400755060. Its totient is φ = 399933568.

The previous prime is 400344293. The next prime is 400344331. The reversal of 400344313 is 313443004.

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

It can be written as a sum of positive squares in 2 ways, for example, as 391564944 + 8779369 = 19788^2 + 2963^2 .

It is a cyclic number.

It is not a de Polignac number, because 400344313 - 2²⁵ = 366789881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400344613) 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, 203908 + ... + 205861.

It is an arithmetic number, because the mean of its divisors is an integer number (100188765).

Almost surely, 2^400344313 is an apocalyptic number.

It is an amenable number.

400344313 is a deficient number, since it is larger than the sum of its proper divisors (410747).

400344313 is an equidigital number, since it uses as much as digits as its factorization.

400344313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410746.

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 400344313 is about 20008.6059734305. The cubic root of 400344313 is about 737.0176490873.

Adding to 400344313 its reverse (313443004), we get a palindrome (713787317).

The spelling of 400344313 in words is "four hundred million, three hundred forty-four thousand, three hundred thirteen".