18645125 has 8 divisors (see below), whose sum is σ = 23269272. Its totient is φ = 14916000.

The previous prime is 18645103. The next prime is 18645127. The reversal of 18645125 is 52154681.

It is a Cunningham number, because it is equal to 4318²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 18645124 = 1^2 + 4318^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18645125 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18645091 and 18645100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18645127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74456 + ... + 74705.

It is an arithmetic number, because the mean of its divisors is an integer number (2908659).

Almost surely, 2^18645125 is an apocalyptic number.

It is an amenable number.

18645125 is a deficient number, since it is larger than the sum of its proper divisors (4624147).

18645125 is an equidigital number, since it uses as much as digits as its factorization.

18645125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149176 (or 149166 counting only the distinct ones).

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

The square root of 18645125 is about 4318.0001157943. Note that the first 3 decimals coincide. The cubic root of 18645125 is about 265.1683989579.

The spelling of 18645125 in words is "eighteen million, six hundred forty-five thousand, one hundred twenty-five".