18210223 has 4 divisors (see below), whose sum is σ = 18380520. Its totient is φ = 18039928.

The previous prime is 18210209. The next prime is 18210239. The reversal of 18210223 is 32201281.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18210223 is a prime.

It is a super-2 number, since 2×18210223² = 663224443419458, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18210223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18210263) 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, 84988 + ... + 85201.

It is an arithmetic number, because the mean of its divisors is an integer number (4595130).

Almost surely, 2^18210223 is an apocalyptic number.

18210223 is a deficient number, since it is larger than the sum of its proper divisors (170297).

18210223 is a wasteful number, since it uses less digits than its factorization.

18210223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170296.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 18210223 is about 4267.3437874162. The cubic root of 18210223 is about 263.0904525819.

The spelling of 18210223 in words is "eighteen million, two hundred ten thousand, two hundred twenty-three".