18222490 has 32 divisors (see below), whose sum is σ = 38537856. Its totient is φ = 6116160.

The previous prime is 18222473. The next prime is 18222541. The reversal of 18222490 is 9422281.

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, 4942 + ... + 7801.

It is an arithmetic number, because the mean of its divisors is an integer number (1204308).

Almost surely, 2^18222490 is an apocalyptic number.

18222490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18222490 is an abundant number, since it is smaller than the sum of its proper divisors (20315366).

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

18222490 is a wasteful number, since it uses less digits than its factorization.

18222490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12774.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 18222490 is about 4268.7808564039. The cubic root of 18222490 is about 263.1495147577.

The spelling of 18222490 in words is "eighteen million, two hundred twenty-two thousand, four hundred ninety".