398899999 has 2 divisors, whose sum is σ = 398900000. Its totient is φ = 398899998.

The previous prime is 398899973. The next prime is 398900009. The reversal of 398899999 is 999998893.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 398899999 - 2⁵ = 398899967 is a prime.

398899999 is a modest number, since divided by 99999 gives 3988 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398899099) 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, 199449999 + 199450000.

It is an arithmetic number, because the mean of its divisors is an integer number (199450000).

Almost surely, 2^398899999 is an apocalyptic number.

398899999 is a deficient number, since it is larger than the sum of its proper divisors (1).

398899999 is an equidigital number, since it uses as much as digits as its factorization.

398899999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 102036672, while the sum is 73.

The square root of 398899999 is about 19972.4810426747. The cubic root of 398899999 is about 736.1302732686.

The spelling of 398899999 in words is "three hundred ninety-eight million, eight hundred ninety-nine thousand, nine hundred ninety-nine".