18866125 has 8 divisors (see below), whose sum is σ = 23545080. Its totient is φ = 15092800.

The previous prime is 18866123. The next prime is 18866161. The reversal of 18866125 is 52166881.

It can be written as a sum of positive squares in 4 ways, for example, as 39204 + 18826921 = 198^2 + 4339^2 .

It is not a de Polignac number, because 18866125 - 2¹ = 18866123 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18866123) 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, 75340 + ... + 75589.

It is an arithmetic number, because the mean of its divisors is an integer number (2943135).

Almost surely, 2^18866125 is an apocalyptic number.

It is an amenable number.

18866125 is a deficient number, since it is larger than the sum of its proper divisors (4678955).

18866125 is an equidigital number, since it uses as much as digits as its factorization.

18866125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150944 (or 150934 counting only the distinct ones).

The product of its digits is 23040, while the sum is 37.

The square root of 18866125 is about 4343.5152814282. The cubic root of 18866125 is about 266.2119638259.

The spelling of 18866125 in words is "eighteen million, eight hundred sixty-six thousand, one hundred twenty-five".