8639980 has 24 divisors (see below), whose sum is σ = 18309312. Its totient is φ = 3424512.

The previous prime is 8639977. The next prime is 8639987. The reversal of 8639980 is 899368.

It is not an unprimeable number, because it can be changed into a prime (8639987) 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 7 ways as a sum of consecutive naturals, for example, 349 + ... + 4171.

It is an arithmetic number, because the mean of its divisors is an integer number (762888).

Almost surely, 2^8639980 is an apocalyptic number.

It is an amenable number.

8639980 is an abundant number, since it is smaller than the sum of its proper divisors (9669332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8639980 is a wasteful number, since it uses less digits than its factorization.

8639980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3945 (or 3943 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 8639980 is about 2939.3842892688. The cubic root of 8639980 is about 205.1969552700.

The spelling of 8639980 in words is "eight million, six hundred thirty-nine thousand, nine hundred eighty".