8639944 has 48 divisors (see below), whose sum is σ = 17848980. Its totient is φ = 3916800.

The previous prime is 8639923. The next prime is 8639951. The reversal of 8639944 is 4499368.

It can be written as a sum of positive squares in 6 ways, for example, as 8631844 + 8100 = 2938^2 + 90^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 8639944.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85494 + ... + 85594.

Almost surely, 2^8639944 is an apocalyptic number.

It is an amenable number.

8639944 is an abundant number, since it is smaller than the sum of its proper divisors (9209036).

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

8639944 is a wasteful number, since it uses less digits than its factorization.

8639944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178 (or 157 counting only the distinct ones).

The product of its digits is 186624, while the sum is 43.

The square root of 8639944 is about 2939.3781655309. The cubic root of 8639944 is about 205.1966702731.

The spelling of 8639944 in words is "eight million, six hundred thirty-nine thousand, nine hundred forty-four".