398438899 has 2 divisors, whose sum is σ = 398438900. Its totient is φ = 398438898.

The previous prime is 398438879. The next prime is 398438947. The reversal of 398438899 is 998834893.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 398438899 - 2⁷ = 398438771 is a prime.

It is not a weakly prime, because it can be changed into another prime (398438869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199219449 + 199219450.

It is an arithmetic number, because the mean of its divisors is an integer number (199219450).

Almost surely, 2^398438899 is an apocalyptic number.

398438899 is a deficient number, since it is larger than the sum of its proper divisors (1).

398438899 is an equidigital number, since it uses as much as digits as its factorization.

398438899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13436928, while the sum is 61.

The square root of 398438899 is about 19960.9343218197. The cubic root of 398438899 is about 735.8465258470.

The spelling of 398438899 in words is "three hundred ninety-eight million, four hundred thirty-eight thousand, eight hundred ninety-nine".