399578323 has 2 divisors, whose sum is σ = 399578324. Its totient is φ = 399578322.

The previous prime is 399578279. The next prime is 399578371. The reversal of 399578323 is 323875993.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399578323 - 2²⁵ = 366023891 is a prime.

It is a super-2 number, since 2×399578323² = 319325672422984658, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (399578383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199789161 + 199789162.

It is an arithmetic number, because the mean of its divisors is an integer number (199789162).

Almost surely, 2^399578323 is an apocalyptic number.

399578323 is a deficient number, since it is larger than the sum of its proper divisors (1).

399578323 is an equidigital number, since it uses as much as digits as its factorization.

399578323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1224720, while the sum is 49.

The square root of 399578323 is about 19989.4552952300. The cubic root of 399578323 is about 736.5472968021.

The spelling of 399578323 in words is "three hundred ninety-nine million, five hundred seventy-eight thousand, three hundred twenty-three".