18258227 has 4 divisors (see below), whose sum is σ = 19662720. Its totient is φ = 16853736.

The previous prime is 18258217. The next prime is 18258239. The reversal of 18258227 is 72285281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72285281 = 83 ⋅870907.

It is a cyclic number.

It is not a de Polignac number, because 18258227 - 2¹⁰ = 18257203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18258217) 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, 702227 + ... + 702252.

It is an arithmetic number, because the mean of its divisors is an integer number (4915680).

Almost surely, 2^18258227 is an apocalyptic number.

18258227 is a deficient number, since it is larger than the sum of its proper divisors (1404493).

18258227 is a wasteful number, since it uses less digits than its factorization.

18258227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1404492.

The product of its digits is 17920, while the sum is 35.

The square root of 18258227 is about 4272.9646616840. The cubic root of 18258227 is about 263.3214274736.

The spelling of 18258227 in words is "eighteen million, two hundred fifty-eight thousand, two hundred twenty-seven".