18945825 has 12 divisors (see below), whose sum is σ = 31323888. Its totient is φ = 10104400.

The previous prime is 18945821. The next prime is 18945877. The reversal of 18945825 is 52854981.

It is a happy number.

It is not a de Polignac number, because 18945825 - 2² = 18945821 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18945821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126231 + ... + 126380.

It is an arithmetic number, because the mean of its divisors is an integer number (2610324).

Almost surely, 2^18945825 is an apocalyptic number.

18945825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18945825 is a deficient number, since it is larger than the sum of its proper divisors (12378063).

18945825 is a wasteful number, since it uses less digits than its factorization.

18945825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252624 (or 252619 counting only the distinct ones).

The product of its digits is 115200, while the sum is 42.

The square root of 18945825 is about 4352.6802087909. The cubic root of 18945825 is about 266.5863082522.

The spelling of 18945825 in words is "eighteen million, nine hundred forty-five thousand, eight hundred twenty-five".