16989816 has 64 divisors (see below), whose sum is σ = 44161920. Its totient is φ = 5443200.

The previous prime is 16989799. The next prime is 16989821. The reversal of 16989816 is 61898961.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104151 + ... + 104313.

It is an arithmetic number, because the mean of its divisors is an integer number (690030).

Almost surely, 2^16989816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16989816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22080960).

16989816 is an abundant number, since it is smaller than the sum of its proper divisors (27172104).

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

16989816 is a wasteful number, since it uses less digits than its factorization.

16989816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316 (or 312 counting only the distinct ones).

The product of its digits is 186624, while the sum is 48.

The square root of 16989816 is about 4121.8704492014. The cubic root of 16989816 is about 257.0768038454.

The spelling of 16989816 in words is "sixteen million, nine hundred eighty-nine thousand, eight hundred sixteen".