16639944 has 32 divisors (see below), whose sum is σ = 41766720. Its totient is φ = 5524416.

The previous prime is 16639943. The next prime is 16639951. The reversal of 16639944 is 44993661.

It is a junction number, because it is equal to n+sod(n) for n = 16639896 and 16639905.

It is not an unprimeable number, because it can be changed into a prime (16639943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5397 + ... + 7899.

It is an arithmetic number, because the mean of its divisors is an integer number (1305210).

Almost surely, 2^16639944 is an apocalyptic number.

It is an amenable number.

16639944 is an abundant number, since it is smaller than the sum of its proper divisors (25126776).

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

16639944 is a wasteful number, since it uses less digits than its factorization.

16639944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2789 (or 2785 counting only the distinct ones).

The product of its digits is 139968, while the sum is 42.

The square root of 16639944 is about 4079.2087468037. The cubic root of 16639944 is about 255.2998855597.

The spelling of 16639944 in words is "sixteen million, six hundred thirty-nine thousand, nine hundred forty-four".