399798899 has 2 divisors, whose sum is σ = 399798900. Its totient is φ = 399798898.

The previous prime is 399798887. The next prime is 399798923. The reversal of 399798899 is 998897993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399798899 - 2⁸ = 399798643 is a prime.

It is a super-2 number, since 2×399798899² = 319678319283224402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (399798499) 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, 199899449 + 199899450.

It is an arithmetic number, because the mean of its divisors is an integer number (199899450).

Almost surely, 2^399798899 is an apocalyptic number.

399798899 is a deficient number, since it is larger than the sum of its proper divisors (1).

399798899 is an equidigital number, since it uses as much as digits as its factorization.

399798899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 79361856, while the sum is 71.

The square root of 399798899 is about 19994.9718429409. The cubic root of 399798899 is about 736.6828019598.

The spelling of 399798899 in words is "three hundred ninety-nine million, seven hundred ninety-eight thousand, eight hundred ninety-nine".