399012137 has 2 divisors, whose sum is σ = 399012138. Its totient is φ = 399012136.

The previous prime is 399012113. The next prime is 399012157. The reversal of 399012137 is 731210993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 291350761 + 107661376 = 17069^2 + 10376^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399012137 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 399012097 and 399012106.

It is not a weakly prime, because it can be changed into another prime (399012157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199506068 + 199506069.

It is an arithmetic number, because the mean of its divisors is an integer number (199506069).

Almost surely, 2^399012137 is an apocalyptic number.

It is an amenable number.

399012137 is a deficient number, since it is larger than the sum of its proper divisors (1).

399012137 is an equidigital number, since it uses as much as digits as its factorization.

399012137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206, while the sum is 35.

The square root of 399012137 is about 19975.2881581218. The cubic root of 399012137 is about 736.1992466477.

The spelling of 399012137 in words is "three hundred ninety-nine million, twelve thousand, one hundred thirty-seven".