18109926 has 48 divisors (see below), whose sum is σ = 42519600. Its totient is φ = 5712768.

The previous prime is 18109849. The next prime is 18109937. The reversal of 18109926 is 62990181.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19030 + ... + 19958.

It is an arithmetic number, because the mean of its divisors is an integer number (885825).

Almost surely, 2^18109926 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18109926, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21259800).

18109926 is an abundant number, since it is smaller than the sum of its proper divisors (24409674).

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

18109926 is a wasteful number, since it uses less digits than its factorization.

18109926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978 (or 953 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 18109926 is about 4255.5758717241. The cubic root of 18109926 is about 262.6065526612.

The spelling of 18109926 in words is "eighteen million, one hundred nine thousand, nine hundred twenty-six".