18121888 has 24 divisors (see below), whose sum is σ = 36112608. Its totient is φ = 8950464.

The previous prime is 18121867. The next prime is 18121891. The reversal of 18121888 is 88812181.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 756 + ... + 6067.

It is an arithmetic number, because the mean of its divisors is an integer number (1504692).

Almost surely, 2^18121888 is an apocalyptic number.

It is an amenable number.

18121888 is a deficient number, since it is larger than the sum of its proper divisors (17990720).

18121888 is an equidigital number, since it uses as much as digits as its factorization.

18121888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6916 (or 6908 counting only the distinct ones).

The product of its digits is 8192, while the sum is 37.

The square root of 18121888 is about 4256.9810899275. The cubic root of 18121888 is about 262.6643590488.

The spelling of 18121888 in words is "eighteen million, one hundred twenty-one thousand, eight hundred eighty-eight".