399798073 has 2 divisors, whose sum is σ = 399798074. Its totient is φ = 399798072.

The previous prime is 399798059. The next prime is 399798083. The reversal of 399798073 is 370897993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 213393664 + 186404409 = 14608^2 + 13653^2 .

It is a cyclic number.

It is not a de Polignac number, because 399798073 - 2⁹ = 399797561 is a prime.

It is not a weakly prime, because it can be changed into another prime (399798023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199899036 + 199899037.

It is an arithmetic number, because the mean of its divisors is an integer number (199899037).

Almost surely, 2^399798073 is an apocalyptic number.

It is an amenable number.

399798073 is a deficient number, since it is larger than the sum of its proper divisors (1).

399798073 is an equidigital number, since it uses as much as digits as its factorization.

399798073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2571912, while the sum is 55.

The square root of 399798073 is about 19994.9511877374. The cubic root of 399798073 is about 736.6822946210.

The spelling of 399798073 in words is "three hundred ninety-nine million, seven hundred ninety-eight thousand, seventy-three".