18399227 has 16 divisors (see below), whose sum is σ = 23476992. Its totient is φ = 14001120.

The previous prime is 18399223. The next prime is 18399229. The reversal of 18399227 is 72299381.

It is a happy number.

It is not a de Polignac number, because 18399227 - 2² = 18399223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18399223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 533 + ... + 6089.

It is an arithmetic number, because the mean of its divisors is an integer number (1467312).

Almost surely, 2^18399227 is an apocalyptic number.

18399227 is a deficient number, since it is larger than the sum of its proper divisors (5077765).

18399227 is a wasteful number, since it uses less digits than its factorization.

18399227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5618.

The product of its digits is 54432, while the sum is 41.

The square root of 18399227 is about 4289.4320136820. The cubic root of 18399227 is about 263.9975273337.

The spelling of 18399227 in words is "eighteen million, three hundred ninety-nine thousand, two hundred twenty-seven".