18045440 has 160 divisors (see below), whose sum is σ = 53032320. Its totient is φ = 5750784.

The previous prime is 18045439. The next prime is 18045451. The reversal of 18045440 is 4454081.

It is a tau number, because it is divible by the number of its divisors (160).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 340454 + ... + 340506.

It is an arithmetic number, because the mean of its divisors is an integer number (331452).

Almost surely, 2^18045440 is an apocalyptic number.

18045440 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 18045440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26516160).

18045440 is an abundant number, since it is smaller than the sum of its proper divisors (34986880).

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

18045440 is an equidigital number, since it uses as much as digits as its factorization.

18045440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102 (or 86 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 18045440 is about 4247.9924670366. The cubic root of 18045440 is about 262.2944846434.

The spelling of 18045440 in words is "eighteen million, forty-five thousand, four hundred forty".