18399226 has 8 divisors (see below), whose sum is σ = 27628704. Its totient is φ = 9189660.

The previous prime is 18399223. The next prime is 18399229. The reversal of 18399226 is 62299381.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18399223) and next prime (18399229).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (18399223) 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, 2400 + ... + 6523.

It is an arithmetic number, because the mean of its divisors is an integer number (3453588).

Almost surely, 2^18399226 is an apocalyptic number.

18399226 is a deficient number, since it is larger than the sum of its proper divisors (9229478).

18399226 is a wasteful number, since it uses less digits than its factorization.

18399226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9956.

The product of its digits is 46656, while the sum is 40.

The square root of 18399226 is about 4289.4318971164. The cubic root of 18399226 is about 263.9975225510.

The spelling of 18399226 in words is "eighteen million, three hundred ninety-nine thousand, two hundred twenty-six".