398735889 has 16 divisors (see below), whose sum is σ = 557107200. Its totient is φ = 253192016.

The previous prime is 398735873. The next prime is 398735893. The reversal of 398735889 is 988537893.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 398735889 - 2⁴ = 398735873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (398735809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4402 + ... + 28580.

It is an arithmetic number, because the mean of its divisors is an integer number (34819200).

Almost surely, 2^398735889 is an apocalyptic number.

It is an amenable number.

398735889 is a deficient number, since it is larger than the sum of its proper divisors (158371311).

398735889 is a wasteful number, since it uses less digits than its factorization.

398735889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24444.

The product of its digits is 13063680, while the sum is 60.

The square root of 398735889 is about 19968.3722170837. The cubic root of 398735889 is about 736.0293098609.

The spelling of 398735889 in words is "three hundred ninety-eight million, seven hundred thirty-five thousand, eight hundred eighty-nine".