18109968 has 20 divisors (see below), whose sum is σ = 46784208. Its totient is φ = 6036640.

The previous prime is 18109963. The next prime is 18109969. The reversal of 18109968 is 86990181.

It is a super-2 number, since 2×18109968² = 655941881922048, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18109961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188598 + ... + 188693.

Almost surely, 2^18109968 is an apocalyptic number.

It is an amenable number.

18109968 is an abundant number, since it is smaller than the sum of its proper divisors (28674240).

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

18109968 is a wasteful number, since it uses less digits than its factorization.

18109968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377302 (or 377296 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 18109968 is about 4255.5808064235. The cubic root of 18109968 is about 262.6067556708.

The spelling of 18109968 in words is "eighteen million, one hundred nine thousand, nine hundred sixty-eight".