399585161 has 2 divisors, whose sum is σ = 399585162. Its totient is φ = 399585160.

The previous prime is 399585103. The next prime is 399585191. The reversal of 399585161 is 161585993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 340771600 + 58813561 = 18460^2 + 7669^2 .

It is a cyclic number.

It is not a de Polignac number, because 399585161 - 2⁶ = 399585097 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (399585191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199792580 + 199792581.

It is an arithmetic number, because the mean of its divisors is an integer number (199792581).

Almost surely, 2^399585161 is an apocalyptic number.

It is an amenable number.

399585161 is a deficient number, since it is larger than the sum of its proper divisors (1).

399585161 is an equidigital number, since it uses as much as digits as its factorization.

399585161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 291600, while the sum is 47.

The square root of 399585161 is about 19989.6263346767. The cubic root of 399585161 is about 736.5514982993.

The spelling of 399585161 in words is "three hundred ninety-nine million, five hundred eighty-five thousand, one hundred sixty-one".