18988223 has 4 divisors (see below), whose sum is σ = 19042368. Its totient is φ = 18934080.

The previous prime is 18988219. The next prime is 18988231. The reversal of 18988223 is 32288981.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32288981 = 337 ⋅95813.

It is a cyclic number.

It is not a de Polignac number, because 18988223 - 2² = 18988219 is a prime.

It is a super-2 number, since 2×18988223² = 721105225395458, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18988253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26543 + ... + 27248.

It is an arithmetic number, because the mean of its divisors is an integer number (4760592).

Almost surely, 2^18988223 is an apocalyptic number.

18988223 is a deficient number, since it is larger than the sum of its proper divisors (54145).

18988223 is an equidigital number, since it uses as much as digits as its factorization.

18988223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54144.

The product of its digits is 55296, while the sum is 41.

The square root of 18988223 is about 4357.5478195884. The cubic root of 18988223 is about 266.7850205538.

It can be divided in two parts, 18988 and 223, that multiplied together give a palindrome (4234324).

The spelling of 18988223 in words is "eighteen million, nine hundred eighty-eight thousand, two hundred twenty-three".