18564425 has 54 divisors (see below), whose sum is σ = 28275534. Its totient is φ = 12038400.

The previous prime is 18564407. The next prime is 18564439. The reversal of 18564425 is 52446581.

It can be written as a sum of positive squares in 3 ways, for example, as 2795584 + 15768841 = 1672^2 + 3971^2 .

It is not a de Polignac number, because 18564425 - 2¹⁴ = 18548041 is a prime.

It is a Curzon number.

It is an unprimeable number.

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 53 ways as a sum of consecutive naturals, for example, 977066 + ... + 977084.

It is an arithmetic number, because the mean of its divisors is an integer number (523621).

Almost surely, 2^18564425 is an apocalyptic number.

It is an amenable number.

18564425 is a deficient number, since it is larger than the sum of its proper divisors (9711109).

18564425 is a wasteful number, since it uses less digits than its factorization.

18564425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87 (or 52 counting only the distinct ones).

The product of its digits is 38400, while the sum is 35.

The square root of 18564425 is about 4308.6453787705. The cubic root of 18564425 is about 264.7852775880.

The spelling of 18564425 in words is "eighteen million, five hundred sixty-four thousand, four hundred twenty-five".