18226992 has 80 divisors (see below), whose sum is σ = 56996352. Its totient is φ = 4899840.

The previous prime is 18226987. The next prime is 18227003. The reversal of 18226992 is 29962281.

It is a self number, because there is not a number n which added to its sum of digits gives 18226992.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4117 + ... + 7307.

Almost surely, 2^18226992 is an apocalyptic number.

18226992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18226992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28498176).

18226992 is an abundant number, since it is smaller than the sum of its proper divisors (38769360).

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

18226992 is a wasteful number, since it uses less digits than its factorization.

18226992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3226 (or 3220 counting only the distinct ones).

The product of its digits is 31104, while the sum is 39.

The square root of 18226992 is about 4269.3081406710. The cubic root of 18226992 is about 263.1711839801.

The spelling of 18226992 in words is "eighteen million, two hundred twenty-six thousand, nine hundred ninety-two".