398989731385 has 16 divisors (see below), whose sum is σ = 548449646976. Its totient is φ = 272961093888.

The previous prime is 398989731379. The next prime is 398989731389. The reversal of 398989731385 is 583137989893.

It is not a de Polignac number, because 398989731385 - 2²⁷ = 398855513657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (398989731389) 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 in 15 ways as a sum of consecutive naturals, for example, 13148479 + ... + 13178788.

It is an arithmetic number, because the mean of its divisors is an integer number (34278102936).

Almost surely, 2^398989731385 is an apocalyptic number.

398989731385 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

398989731385 is a deficient number, since it is larger than the sum of its proper divisors (149459915591).

398989731385 is a wasteful number, since it uses less digits than its factorization.

398989731385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26327712.

The product of its digits is 352719360, while the sum is 73.

The spelling of 398989731385 in words is "three hundred ninety-eight billion, nine hundred eighty-nine million, seven hundred thirty-one thousand, three hundred eighty-five".