16989388 has 24 divisors (see below), whose sum is σ = 32387040. Its totient is φ = 7751040.

The previous prime is 16989383. The next prime is 16989397. The reversal of 16989388 is 88398961.

It is a super-2 number, since 2×16989388² = 577278609229088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is not an unprimeable number, because it can be changed into a prime (16989383) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2793 + ... + 6463.

It is an arithmetic number, because the mean of its divisors is an integer number (1349460).

Almost surely, 2^16989388 is an apocalyptic number.

It is an amenable number.

16989388 is a deficient number, since it is larger than the sum of its proper divisors (15397652).

16989388 is a wasteful number, since it uses less digits than its factorization.

16989388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3777 (or 3775 counting only the distinct ones).

The product of its digits is 746496, while the sum is 52.

The square root of 16989388 is about 4121.8185306973. The cubic root of 16989388 is about 257.0746451052.

The spelling of 16989388 in words is "sixteen million, nine hundred eighty-nine thousand, three hundred eighty-eight".