399157313 has 4 divisors (see below), whose sum is σ = 399611268. Its totient is φ = 398703360.

The previous prime is 399157279. The next prime is 399157327. The reversal of 399157313 is 313751993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 313751993 = 23 ⋅13641391.

It can be written as a sum of positive squares in 2 ways, for example, as 276656689 + 122500624 = 16633^2 + 11068^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399157313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399157013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225656 + ... + 227417.

It is an arithmetic number, because the mean of its divisors is an integer number (99902817).

Almost surely, 2^399157313 is an apocalyptic number.

It is an amenable number.

399157313 is a deficient number, since it is larger than the sum of its proper divisors (453955).

399157313 is an equidigital number, since it uses as much as digits as its factorization.

399157313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453954.

The product of its digits is 76545, while the sum is 41.

The square root of 399157313 is about 19978.9217176503. The cubic root of 399157313 is about 736.2885217118.

The spelling of 399157313 in words is "three hundred ninety-nine million, one hundred fifty-seven thousand, three hundred thirteen".