18725440 has 56 divisors (see below), whose sum is σ = 44988480. Its totient is φ = 7423488.

The previous prime is 18725429. The next prime is 18725453. The reversal of 18725440 is 4452781.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51981 + ... + 52339.

Almost surely, 2^18725440 is an apocalyptic number.

18725440 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 18725440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22494240).

18725440 is an abundant number, since it is smaller than the sum of its proper divisors (26263040).

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

18725440 is a wasteful number, since it uses less digits than its factorization.

18725440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539 (or 529 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 18725440 is about 4327.2901451139. The cubic root of 18725440 is about 265.5485965262.

The spelling of 18725440 in words is "eighteen million, seven hundred twenty-five thousand, four hundred forty".