18645625 has 10 divisors (see below), whose sum is σ = 23300354. Its totient is φ = 14916000.

The previous prime is 18645619. The next prime is 18645629. The reversal of 18645625 is 52654681.

It can be written as a sum of positive squares in 5 ways, for example, as 7991929 + 10653696 = 2827^2 + 3264^2 .

It is not a de Polignac number, because 18645625 - 2¹³ = 18637433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18645629) 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 9 ways as a sum of consecutive naturals, for example, 14292 + ... + 15541.

Almost surely, 2^18645625 is an apocalyptic number.

It is an amenable number.

18645625 is a deficient number, since it is larger than the sum of its proper divisors (4654729).

18645625 is an frugal number, since it uses more digits than its factorization.

18645625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29853 (or 29838 counting only the distinct ones).

The product of its digits is 57600, while the sum is 37.

The square root of 18645625 is about 4318.0580125793. The cubic root of 18645625 is about 265.1707692470.

The spelling of 18645625 in words is "eighteen million, six hundred forty-five thousand, six hundred twenty-five".