18705525 has 36 divisors (see below), whose sum is σ = 32890752. Its totient is φ = 9378560.

The previous prime is 18705523. The next prime is 18705527. The reversal of 18705525 is 52550781.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18705523) and next prime (18705527).

It is not a de Polignac number, because 18705525 - 2¹ = 18705523 is a prime.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18705523) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 21244 + ... + 22106.

It is an arithmetic number, because the mean of its divisors is an integer number (913632).

Almost surely, 2^18705525 is an apocalyptic number.

18705525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18705525 is a deficient number, since it is larger than the sum of its proper divisors (14185227).

18705525 is a wasteful number, since it uses less digits than its factorization.

18705525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910 (or 888 counting only the distinct ones).

The product of its (nonzero) digits is 14000, while the sum is 33.

The square root of 18705525 is about 4324.9884392909. The cubic root of 18705525 is about 265.4544238180.

The spelling of 18705525 in words is "eighteen million, seven hundred five thousand, five hundred twenty-five".