18107440 has 80 divisors (see below), whose sum is σ = 47371968. Its totient is φ = 6386688.

The previous prime is 18107351. The next prime is 18107443. The reversal of 18107440 is 4470181.

18107440 is nontrivially palindromic in base 11.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (18107443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23542 + ... + 24298.

Almost surely, 2^18107440 is an apocalyptic number.

18107440 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 18107440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23685984).

18107440 is an abundant number, since it is smaller than the sum of its proper divisors (29264528).

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

18107440 is a wasteful number, since it uses less digits than its factorization.

18107440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806 (or 800 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 18107440 is about 4255.2837743210. The cubic root of 18107440 is about 262.5945358669.

The spelling of 18107440 in words is "eighteen million, one hundred seven thousand, four hundred forty".