18709725 has 12 divisors (see below), whose sum is σ = 30933536. Its totient is φ = 9978480.

The previous prime is 18709723. The next prime is 18709729. The reversal of 18709725 is 52790781.

It is not a de Polignac number, because 18709725 - 2¹ = 18709723 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18709721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 124657 + ... + 124806.

Almost surely, 2^18709725 is an apocalyptic number.

18709725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18709725 is a deficient number, since it is larger than the sum of its proper divisors (12223811).

18709725 is a wasteful number, since it uses less digits than its factorization.

18709725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249476 (or 249471 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 18709725 is about 4325.4739624693. The cubic root of 18709725 is about 265.4742900544.

The spelling of 18709725 in words is "eighteen million, seven hundred nine thousand, seven hundred twenty-five".