16818389 has 16 divisors (see below), whose sum is σ = 20620800. Its totient is φ = 13388544.

The previous prime is 16818383. The next prime is 16818391. The reversal of 16818389 is 98381861.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 16818389 - 2⁸ = 16818133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16818383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8507 + ... + 10295.

It is an arithmetic number, because the mean of its divisors is an integer number (1288800).

Almost surely, 2^16818389 is an apocalyptic number.

It is an amenable number.

16818389 is a deficient number, since it is larger than the sum of its proper divisors (3802411).

16818389 is a wasteful number, since it uses less digits than its factorization.

16818389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1892.

The product of its digits is 82944, while the sum is 44.

The square root of 16818389 is about 4101.0229211747. The cubic root of 16818389 is about 256.2092456305.

The spelling of 16818389 in words is "sixteen million, eight hundred eighteen thousand, three hundred eighty-nine".