989398865 has 32 divisors (see below), whose sum is σ = 1463804160. Its totient is φ = 625169664.

The previous prime is 989398841. The next prime is 989398877. The reversal of 989398865 is 568893989.

It is not a de Polignac number, because 989398865 - 2⁶ = 989398801 is a prime.

It is a super-2 number, since 2×989398865² = 1957820228126576450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 321062 + ... + 324128.

It is an arithmetic number, because the mean of its divisors is an integer number (45743880).

Almost surely, 2^989398865 is an apocalyptic number.

It is an amenable number.

989398865 is a deficient number, since it is larger than the sum of its proper divisors (474405295).

989398865 is a wasteful number, since it uses less digits than its factorization.

989398865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3801.

The product of its digits is 33592320, while the sum is 65.

The square root of 989398865 is about 31454.7113323267. The cubic root of 989398865 is about 996.4537271482.

The spelling of 989398865 in words is "nine hundred eighty-nine million, three hundred ninety-eight thousand, eight hundred sixty-five".