18222656 has 14 divisors (see below), whose sum is σ = 36160710. Its totient is φ = 9111296.

The previous prime is 18222613. The next prime is 18222667. The reversal of 18222656 is 65622281.

It can be written as a sum of positive squares in only one way, i.e., 11669056 + 6553600 = 3416^2 + 2560^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142301 + ... + 142428.

Almost surely, 2^18222656 is an apocalyptic number.

18222656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18222656 is a deficient number, since it is larger than the sum of its proper divisors (17938054).

18222656 is an equidigital number, since it uses as much as digits as its factorization.

18222656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284741 (or 284731 counting only the distinct ones).

The product of its digits is 11520, while the sum is 32.

The square root of 18222656 is about 4268.8002998501. The cubic root of 18222656 is about 263.1503138195.

The spelling of 18222656 in words is "eighteen million, two hundred twenty-two thousand, six hundred fifty-six".