18222894 has 40 divisors (see below), whose sum is σ = 41111928. Its totient is φ = 6032880.

The previous prime is 18222871. The next prime is 18222913. The reversal of 18222894 is 49822281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 31629 + ... + 32199.

Almost surely, 2^18222894 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18222894, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20555964).

18222894 is an abundant number, since it is smaller than the sum of its proper divisors (22889034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18222894 is a wasteful number, since it uses less digits than its factorization.

18222894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782 (or 773 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 18222894 is about 4268.8281764437. The cubic root of 18222894 is about 263.1514594539.

The spelling of 18222894 in words is "eighteen million, two hundred twenty-two thousand, eight hundred ninety-four".