399899029 has 2 divisors, whose sum is σ = 399899030. Its totient is φ = 399899028.

The previous prime is 399898963. The next prime is 399899069. The reversal of 399899029 is 920998993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 394618225 + 5280804 = 19865^2 + 2298^2 .

It is a cyclic number.

It is not a de Polignac number, because 399899029 - 2⁷ = 399898901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399899069) 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, 199949514 + 199949515.

It is an arithmetic number, because the mean of its divisors is an integer number (199949515).

Almost surely, 2^399899029 is an apocalyptic number.

It is an amenable number.

399899029 is a deficient number, since it is larger than the sum of its proper divisors (1).

399899029 is an equidigital number, since it uses as much as digits as its factorization.

399899029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2834352, while the sum is 58.

The square root of 399899029 is about 19997.4755656808. The cubic root of 399899029 is about 736.7442977867.

The spelling of 399899029 in words is "three hundred ninety-nine million, eight hundred ninety-nine thousand, twenty-nine".