18394222 has 32 divisors (see below), whose sum is σ = 35518464. Its totient is φ = 6933600.

The previous prime is 18394213. The next prime is 18394231. The reversal of 18394222 is 22249381.

It is an interprime number because it is at equal distance from previous prime (18394213) and next prime (18394231).

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2848 + ... + 6700.

It is an arithmetic number, because the mean of its divisors is an integer number (1109952).

Almost surely, 2^18394222 is an apocalyptic number.

18394222 is a deficient number, since it is larger than the sum of its proper divisors (17124242).

18394222 is a wasteful number, since it uses less digits than its factorization.

18394222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3904.

The product of its digits is 6912, while the sum is 31.

The square root of 18394222 is about 4288.8485634259. The cubic root of 18394222 is about 263.9735874249.

The spelling of 18394222 in words is "eighteen million, three hundred ninety-four thousand, two hundred twenty-two".