18009125 has 8 divisors (see below), whose sum is σ = 22475544. Its totient is φ = 14407200.

The previous prime is 18009119. The next prime is 18009133. The reversal of 18009125 is 52190081.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 82369 + 17926756 = 287^2 + 4234^2 .

It is not a de Polignac number, because 18009125 - 2⁸ = 18008869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18009094 and 18009103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71912 + ... + 72161.

It is an arithmetic number, because the mean of its divisors is an integer number (2809443).

Almost surely, 2^18009125 is an apocalyptic number.

It is an amenable number.

18009125 is a deficient number, since it is larger than the sum of its proper divisors (4466419).

18009125 is an equidigital number, since it uses as much as digits as its factorization.

18009125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144088 (or 144078 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 18009125 is about 4243.7159424259. The cubic root of 18009125 is about 262.1184176159.

The spelling of 18009125 in words is "eighteen million, nine thousand, one hundred twenty-five".