399395873 has 2 divisors, whose sum is σ = 399395874. Its totient is φ = 399395872.

The previous prime is 399395833. The next prime is 399395891. The reversal of 399395873 is 378593993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 384434449 + 14961424 = 19607^2 + 3868^2 .

It is a cyclic number.

It is not a de Polignac number, because 399395873 - 2⁶ = 399395809 is a prime.

It is not a weakly prime, because it can be changed into another prime (399395833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199697936 + 199697937.

It is an arithmetic number, because the mean of its divisors is an integer number (199697937).

Almost surely, 2^399395873 is an apocalyptic number.

It is an amenable number.

399395873 is a deficient number, since it is larger than the sum of its proper divisors (1).

399395873 is an equidigital number, since it uses as much as digits as its factorization.

399395873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5511240, while the sum is 56.

The square root of 399395873 is about 19984.8911180421. The cubic root of 399395873 is about 736.4351756774.

The spelling of 399395873 in words is "three hundred ninety-nine million, three hundred ninety-five thousand, eight hundred seventy-three".