18994625 has 16 divisors (see below), whose sum is σ = 25530960. Its totient is φ = 14025600.

The previous prime is 18994609. The next prime is 18994643. The reversal of 18994625 is 52649981.

It can be written as a sum of positive squares in 8 ways, for example, as 3659569 + 15335056 = 1913^2 + 3916^2 .

It is not a de Polignac number, because 18994625 - 2⁴ = 18994609 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 4220 + ... + 7469.

It is an arithmetic number, because the mean of its divisors is an integer number (1595685).

Almost surely, 2^18994625 is an apocalyptic number.

It is an amenable number.

18994625 is a deficient number, since it is larger than the sum of its proper divisors (6536335).

18994625 is a wasteful number, since it uses less digits than its factorization.

18994625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11717 (or 11707 counting only the distinct ones).

The product of its digits is 155520, while the sum is 44.

The square root of 18994625 is about 4358.2823451447. The cubic root of 18994625 is about 266.8149999396.

The spelling of 18994625 in words is "eighteen million, nine hundred ninety-four thousand, six hundred twenty-five".