18240725 has 12 divisors (see below), whose sum is σ = 23602656. Its totient is φ = 13957680.

The previous prime is 18240713. The next prime is 18240743. The reversal of 18240725 is 52704281.

It is not a de Polignac number, because 18240725 - 2⁴ = 18240709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15287 + ... + 16436.

It is an arithmetic number, because the mean of its divisors is an integer number (1966888).

Almost surely, 2^18240725 is an apocalyptic number.

It is an amenable number.

18240725 is a deficient number, since it is larger than the sum of its proper divisors (5361931).

18240725 is a wasteful number, since it uses less digits than its factorization.

18240725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31756 (or 31751 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 18240725 is about 4270.9161780583. The cubic root of 18240725 is about 263.2372622185.

The spelling of 18240725 in words is "eighteen million, two hundred forty thousand, seven hundred twenty-five".