18121768 has 24 divisors (see below), whose sum is σ = 39526650. Its totient is φ = 7766304.

The previous prime is 18121759. The next prime is 18121771. The reversal of 18121768 is 86712181.

It can be written as a sum of positive squares in only one way, i.e., 9229444 + 8892324 = 3038^2 + 2982^2 .

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 5 ways as a sum of consecutive naturals, for example, 22723 + ... + 23506.

Almost surely, 2^18121768 is an apocalyptic number.

It is an amenable number.

18121768 is an abundant number, since it is smaller than the sum of its proper divisors (21404882).

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

18121768 is a wasteful number, since it uses less digits than its factorization.

18121768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46249 (or 46238 counting only the distinct ones).

The product of its digits is 5376, while the sum is 34.

The square root of 18121768 is about 4256.9669954088. The cubic root of 18121768 is about 262.6637792749.

The spelling of 18121768 in words is "eighteen million, one hundred twenty-one thousand, seven hundred sixty-eight".