18945725 has 6 divisors (see below), whose sum is σ = 23492730. Its totient is φ = 15156560.

The previous prime is 18945691. The next prime is 18945727. The reversal of 18945725 is 52754981.

It can be written as a sum of positive squares in 3 ways, for example, as 4853209 + 14092516 = 2203^2 + 3754^2 .

It is not a de Polignac number, because 18945725 - 2⁸ = 18945469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18945727) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 378890 + ... + 378939.

It is an arithmetic number, because the mean of its divisors is an integer number (3915455).

Almost surely, 2^18945725 is an apocalyptic number.

It is an amenable number.

18945725 is a deficient number, since it is larger than the sum of its proper divisors (4547005).

18945725 is an equidigital number, since it uses as much as digits as its factorization.

18945725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757839 (or 757834 counting only the distinct ones).

The product of its digits is 100800, while the sum is 41.

The square root of 18945725 is about 4352.6687216006. The cubic root of 18945725 is about 266.5858392187.

The spelling of 18945725 in words is "eighteen million, nine hundred forty-five thousand, seven hundred twenty-five".