399823057 has 2 divisors, whose sum is σ = 399823058. Its totient is φ = 399823056.

The previous prime is 399823049. The next prime is 399823069. The reversal of 399823057 is 750328993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 346108816 + 53714241 = 18604^2 + 7329^2 .

It is an emirp because it is prime and its reverse (750328993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399823057 - 2³ = 399823049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 399822998 and 399823016.

It is not a weakly prime, because it can be changed into another prime (399823157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199911528 + 199911529.

It is an arithmetic number, because the mean of its divisors is an integer number (199911529).

Almost surely, 2^399823057 is an apocalyptic number.

It is an amenable number.

399823057 is a deficient number, since it is larger than the sum of its proper divisors (1).

399823057 is an equidigital number, since it uses as much as digits as its factorization.

399823057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 46.

The square root of 399823057 is about 19995.5759356914. The cubic root of 399823057 is about 736.6976397734.

The spelling of 399823057 in words is "three hundred ninety-nine million, eight hundred twenty-three thousand, fifty-seven".