399094331 has 2 divisors, whose sum is σ = 399094332. Its totient is φ = 399094330.

The previous prime is 399094307. The next prime is 399094351. The reversal of 399094331 is 133490993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 399094331 - 2²² = 394900027 is a prime.

It is a super-2 number, since 2×399094331² = 318552570072675122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (399094351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199547165 + 199547166.

It is an arithmetic number, because the mean of its divisors is an integer number (199547166).

Almost surely, 2^399094331 is an apocalyptic number.

399094331 is a deficient number, since it is larger than the sum of its proper divisors (1).

399094331 is an equidigital number, since it uses as much as digits as its factorization.

399094331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78732, while the sum is 41.

The square root of 399094331 is about 19977.3454442776. The cubic root of 399094331 is about 736.2497939876.

The spelling of 399094331 in words is "three hundred ninety-nine million, ninety-four thousand, three hundred thirty-one".