399155129 has 2 divisors, whose sum is σ = 399155130. Its totient is φ = 399155128.

The previous prime is 399155123. The next prime is 399155191. The reversal of 399155129 is 921551993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 311451904 + 87703225 = 17648^2 + 9365^2 .

It is an emirp because it is prime and its reverse (921551993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399155129 - 2¹² = 399151033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 399155129.

It is not a weakly prime, because it can be changed into another prime (399155123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199577564 + 199577565.

It is an arithmetic number, because the mean of its divisors is an integer number (199577565).

Almost surely, 2^399155129 is an apocalyptic number.

It is an amenable number.

399155129 is a deficient number, since it is larger than the sum of its proper divisors (1).

399155129 is an equidigital number, since it uses as much as digits as its factorization.

399155129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 109350, while the sum is 44.

The square root of 399155129 is about 19978.8670599711. The cubic root of 399155129 is about 736.2871788351.

The spelling of 399155129 in words is "three hundred ninety-nine million, one hundred fifty-five thousand, one hundred twenty-nine".