18165425 has 24 divisors (see below), whose sum is σ = 23956800. Its totient is φ = 13625280.

The previous prime is 18165391. The next prime is 18165431. The reversal of 18165425 is 52456181.

It is not a de Polignac number, because 18165425 - 2²² = 13971121 is a prime.

It is a super-3 number, since 3×18165425³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18165391 and 18165400.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79211 + ... + 79439.

It is an arithmetic number, because the mean of its divisors is an integer number (998200).

Almost surely, 2^18165425 is an apocalyptic number.

It is an amenable number.

18165425 is a deficient number, since it is larger than the sum of its proper divisors (5791375).

18165425 is a wasteful number, since it uses less digits than its factorization.

18165425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425 (or 420 counting only the distinct ones).

The product of its digits is 9600, while the sum is 32.

The square root of 18165425 is about 4262.0916226660. The cubic root of 18165425 is about 262.8745371596.

The spelling of 18165425 in words is "eighteen million, one hundred sixty-five thousand, four hundred twenty-five".