18109696 has 72 divisors (see below), whose sum is σ = 40471200. Its totient is φ = 8017920.

The previous prime is 18109691. The next prime is 18109697. The reversal of 18109696 is 69690181.

18109696 is nontrivially palindromic in base 15.

It is a super-2 number, since 2×18109696² = 655922178424832, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18109691) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 166090 + ... + 166198.

It is an arithmetic number, because the mean of its divisors is an integer number (562100).

Almost surely, 2^18109696 is an apocalyptic number.

18109696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18109696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20235600).

18109696 is an abundant number, since it is smaller than the sum of its proper divisors (22361504).

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

18109696 is a wasteful number, since it uses less digits than its factorization.

18109696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 18109696 is about 4255.5488482686. The cubic root of 18109696 is about 262.6054409364.

The spelling of 18109696 in words is "eighteen million, one hundred nine thousand, six hundred ninety-six".