18518725 has 6 divisors (see below), whose sum is σ = 22963250. Its totient is φ = 14814960.

The previous prime is 18518723. The next prime is 18518771. The reversal of 18518725 is 52781581.

It can be written as a sum of positive squares in 3 ways, for example, as 2916 + 18515809 = 54^2 + 4303^2 .

It is not a de Polignac number, because 18518725 - 2¹ = 18518723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18518723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 370350 + ... + 370399.

Almost surely, 2^18518725 is an apocalyptic number.

It is an amenable number.

18518725 is a deficient number, since it is larger than the sum of its proper divisors (4444525).

18518725 is an equidigital number, since it uses as much as digits as its factorization.

18518725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740759 (or 740754 counting only the distinct ones).

The product of its digits is 22400, while the sum is 37.

The square root of 18518725 is about 4303.3388200326. The cubic root of 18518725 is about 264.5678252978.

The spelling of 18518725 in words is "eighteen million, five hundred eighteen thousand, seven hundred twenty-five".