18222992 has 30 divisors (see below), whose sum is σ = 36926022. Its totient is φ = 8711296.

The previous prime is 18222979. The next prime is 18223003. The reversal of 18222992 is 29922281.

It can be written as a sum of positive squares in only one way, i.e., 11587216 + 6635776 = 3404^2 + 2576^2 .

It is a super-3 number, since 3×18222992³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7388 + ... + 9540.

Almost surely, 2^18222992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18222992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18463011).

18222992 is an abundant number, since it is smaller than the sum of its proper divisors (18703030).

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

18222992 is a wasteful number, since it uses less digits than its factorization.

18222992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2207 (or 2178 counting only the distinct ones).

The product of its digits is 10368, while the sum is 35.

The square root of 18222992 is about 4268.8396549882. The cubic root of 18222992 is about 263.1519311828.

The spelling of 18222992 in words is "eighteen million, two hundred twenty-two thousand, nine hundred ninety-two".