18222788 has 18 divisors (see below), whose sum is σ = 33033546. Its totient is φ = 8795584.

The previous prime is 18222779. The next prime is 18222791. The reversal of 18222788 is 88722281.

It can be written as a sum of positive squares in 3 ways, for example, as 515524 + 17707264 = 718^2 + 4208^2 .

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, 656 + ... + 6072.

It is an arithmetic number, because the mean of its divisors is an integer number (1835197).

Almost surely, 2^18222788 is an apocalyptic number.

It is an amenable number.

18222788 is a deficient number, since it is larger than the sum of its proper divisors (14810758).

18222788 is a wasteful number, since it uses less digits than its factorization.

18222788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5479 (or 5448 counting only the distinct ones).

The product of its digits is 28672, while the sum is 38.

The square root of 18222788 is about 4268.8157608405. The cubic root of 18222788 is about 263.1509492146.

The spelling of 18222788 in words is "eighteen million, two hundred twenty-two thousand, seven hundred eighty-eight".