18902229 has 16 divisors (see below), whose sum is σ = 26248320. Its totient is φ = 12084800.

The previous prime is 18902201. The next prime is 18902231. The reversal of 18902229 is 92220981.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18902229 - 2⁵ = 18902197 is a prime.

It is a super-2 number, since 2×18902229² = 714588522336882, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 18902229.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18902129) 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 15 ways as a sum of consecutive naturals, for example, 13879 + ... + 15179.

It is an arithmetic number, because the mean of its divisors is an integer number (1640520).

Almost surely, 2^18902229 is an apocalyptic number.

It is an amenable number.

18902229 is a deficient number, since it is larger than the sum of its proper divisors (7346091).

18902229 is a wasteful number, since it uses less digits than its factorization.

18902229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 18902229 is about 4347.6693756540. The cubic root of 18902229 is about 266.3816717409.

The spelling of 18902229 in words is "eighteen million, nine hundred two thousand, two hundred twenty-nine".