399157933 has 2 divisors, whose sum is σ = 399157934. Its totient is φ = 399157932.

The previous prime is 399157907. The next prime is 399157987. The reversal of 399157933 is 339751993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 390378564 + 8779369 = 19758^2 + 2963^2 .

It is a cyclic number.

It is not a de Polignac number, because 399157933 - 2⁵ = 399157901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399154933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199578966 + 199578967.

It is an arithmetic number, because the mean of its divisors is an integer number (199578967).

Almost surely, 2^399157933 is an apocalyptic number.

It is an amenable number.

399157933 is a deficient number, since it is larger than the sum of its proper divisors (1).

399157933 is an equidigital number, since it uses as much as digits as its factorization.

399157933 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 688905, while the sum is 49.

The square root of 399157933 is about 19978.9372339972. The cubic root of 399157933 is about 736.2889029304.

The spelling of 399157933 in words is "three hundred ninety-nine million, one hundred fifty-seven thousand, nine hundred thirty-three".