18205725 has 48 divisors (see below), whose sum is σ = 32408640. Its totient is φ = 8985600.

The previous prime is 18205721. The next prime is 18205741. The reversal of 18205725 is 52750281.

It is not a de Polignac number, because 18205725 - 2² = 18205721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18205692 and 18205701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18205721) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 138910 + ... + 139040.

It is an arithmetic number, because the mean of its divisors is an integer number (675180).

Almost surely, 2^18205725 is an apocalyptic number.

18205725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18205725 is a deficient number, since it is larger than the sum of its proper divisors (14202915).

18205725 is a wasteful number, since it uses less digits than its factorization.

18205725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270 (or 265 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 18205725 is about 4266.8167291319. The cubic root of 18205725 is about 263.0687893235.

The spelling of 18205725 in words is "eighteen million, two hundred five thousand, seven hundred twenty-five".