399023137 has 2 divisors, whose sum is σ = 399023138. Its totient is φ = 399023136.

The previous prime is 399023129. The next prime is 399023153. The reversal of 399023137 is 731320993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 374461201 + 24561936 = 19351^2 + 4956^2 .

It is a cyclic number.

It is not a de Polignac number, because 399023137 - 2³ = 399023129 is a prime.

It is a super-4 number, since 4×399023137⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 399023096 and 399023105.

It is not a weakly prime, because it can be changed into another prime (399023197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199511568 + 199511569.

It is an arithmetic number, because the mean of its divisors is an integer number (199511569).

Almost surely, 2^399023137 is an apocalyptic number.

It is an amenable number.

399023137 is a deficient number, since it is larger than the sum of its proper divisors (1).

399023137 is an equidigital number, since it uses as much as digits as its factorization.

399023137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30618, while the sum is 37.

The square root of 399023137 is about 19975.5634964323. The cubic root of 399023137 is about 736.2060117863.

The spelling of 399023137 in words is "three hundred ninety-nine million, twenty-three thousand, one hundred thirty-seven".