18984213 has 20 divisors (see below), whose sum is σ = 28513408. Its totient is φ = 12587400.

The previous prime is 18984187. The next prime is 18984233. The reversal of 18984213 is 31248981.

It is not a de Polignac number, because 18984213 - 2⁶ = 18984149 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 (18984233) 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 19 ways as a sum of consecutive naturals, for example, 17538 + ... + 18588.

Almost surely, 2^18984213 is an apocalyptic number.

It is an amenable number.

18984213 is a deficient number, since it is larger than the sum of its proper divisors (9529195).

18984213 is a wasteful number, since it uses less digits than its factorization.

18984213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286 (or 1277 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 18984213 is about 4357.0876741236. The cubic root of 18984213 is about 266.7662390307.

The spelling of 18984213 in words is "eighteen million, nine hundred eighty-four thousand, two hundred thirteen".