16981224 has 64 divisors (see below), whose sum is σ = 46986240. Its totient is φ = 5080320.

The previous prime is 16981207. The next prime is 16981243. The reversal of 16981224 is 42218961.

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, 10809 + ... + 12279.

It is an arithmetic number, because the mean of its divisors is an integer number (734160).

Almost surely, 2^16981224 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 16981224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23493120).

16981224 is an abundant number, since it is smaller than the sum of its proper divisors (30005016).

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

16981224 is a wasteful number, since it uses less digits than its factorization.

16981224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1530 (or 1526 counting only the distinct ones).

The product of its digits is 6912, while the sum is 33.

The square root of 16981224 is about 4120.8280721234. The cubic root of 16981224 is about 257.0334606970.

It can be divided in two parts, 16981 and 224, that added together give a triangular number (17205 = T₁₈₅).

The spelling of 16981224 in words is "sixteen million, nine hundred eighty-one thousand, two hundred twenty-four".