18172825 has 12 divisors (see below), whose sum is σ = 24583248. Its totient is φ = 13216400.

The previous prime is 18172823. The next prime is 18172837. The reversal of 18172825 is 52827181.

It is not a de Polignac number, because 18172825 - 2¹ = 18172823 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18172823) 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, 32767 + ... + 33316.

It is an arithmetic number, because the mean of its divisors is an integer number (2048604).

Almost surely, 2^18172825 is an apocalyptic number.

It is an amenable number.

18172825 is a deficient number, since it is larger than the sum of its proper divisors (6410423).

18172825 is a wasteful number, since it uses less digits than its factorization.

18172825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66104 (or 66099 counting only the distinct ones).

The product of its digits is 8960, while the sum is 34.

The square root of 18172825 is about 4262.9596526357. The cubic root of 18172825 is about 262.9102278098.

The spelling of 18172825 in words is "eighteen million, one hundred seventy-two thousand, eight hundred twenty-five".