989778986 has 16 divisors (see below), whose sum is σ = 1700455680. Its totient is φ = 423268080.

The previous prime is 989778973. The next prime is 989779003. The reversal of 989778986 is 689877989.

It is a super-2 number, since 2×989778986² = 1959324882254376392, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70226 + ... + 83133.

It is an arithmetic number, because the mean of its divisors is an integer number (106278480).

Almost surely, 2^989778986 is an apocalyptic number.

989778986 is a deficient number, since it is larger than the sum of its proper divisors (710676694).

989778986 is a wasteful number, since it uses less digits than its factorization.

989778986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153829.

The product of its digits is 109734912, while the sum is 71.

The square root of 989778986 is about 31460.7531060526. The cubic root of 989778986 is about 996.5813212876.

The spelling of 989778986 in words is "nine hundred eighty-nine million, seven hundred seventy-eight thousand, nine hundred eighty-six".