18989216 has 24 divisors (see below), whose sum is σ = 37546740. Its totient is φ = 9453568.

The previous prime is 18989213. The next prime is 18989219. The reversal of 18989216 is 61298981.

It is an interprime number because it is at equal distance from previous prime (18989213) and next prime (18989219).

It can be written as a sum of positive squares in 2 ways, for example, as 14409616 + 4579600 = 3796^2 + 2140^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18989213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7070 + ... + 9378.

Almost surely, 2^18989216 is an apocalyptic number.

18989216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18989216 is a deficient number, since it is larger than the sum of its proper divisors (18557524).

18989216 is a wasteful number, since it uses less digits than its factorization.

18989216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2576 (or 2568 counting only the distinct ones).

The product of its digits is 62208, while the sum is 44.

The square root of 18989216 is about 4357.6617583287. The cubic root of 18989216 is about 266.7896710313.

The spelling of 18989216 in words is "eighteen million, nine hundred eighty-nine thousand, two hundred sixteen".