989953979 has 64 divisors (see below), whose sum is σ = 1320883200. Its totient is φ = 721612800.

The previous prime is 989953973. The next prime is 989953999. The reversal of 989953979 is 979359989.

It is a cyclic number.

It is not a de Polignac number, because 989953979 - 2⁴ = 989953963 is a prime.

Its product of digits (49601160) is a multiple of the sum of its prime divisors (324).

It is not an unprimeable number, because it can be changed into a prime (989953973) 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 63 ways as a sum of consecutive naturals, for example, 5469269 + ... + 5469449.

It is an arithmetic number, because the mean of its divisors is an integer number (20638800).

Almost surely, 2^989953979 is an apocalyptic number.

989953979 is a deficient number, since it is larger than the sum of its proper divisors (330929221).

989953979 is a wasteful number, since it uses less digits than its factorization.

989953979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324.

The product of its digits is 49601160, while the sum is 68.

The square root of 989953979 is about 31463.5341149083. The cubic root of 989953979 is about 996.6400497112.

The spelling of 989953979 in words is "nine hundred eighty-nine million, nine hundred fifty-three thousand, nine hundred seventy-nine".