18109040 has 40 divisors (see below), whose sum is σ = 42907968. Its totient is φ = 7105280.

The previous prime is 18109019. The next prime is 18109051. The reversal of 18109040 is 4090181.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 18108997 and 18109015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2105 + ... + 6375.

Almost surely, 2^18109040 is an apocalyptic number.

18109040 is a gapful number since it is divisible by the number (10) 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 18109040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21453984).

18109040 is an abundant number, since it is smaller than the sum of its proper divisors (24798928).

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

18109040 is a wasteful number, since it uses less digits than its factorization.

18109040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4337 (or 4331 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 18109040 is about 4255.4717717311. The cubic root of 18109040 is about 262.6022700521.

The spelling of 18109040 in words is "eighteen million, one hundred nine thousand, forty".