18407225 has 12 divisors (see below), whose sum is σ = 23357136. Its totient is φ = 14382480.

The previous prime is 18407189. The next prime is 18407227. The reversal of 18407225 is 52270481.

It is a de Polignac number, because none of the positive numbers 2^k-18407225 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18407227) 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, 7487 + ... + 9636.

It is an arithmetic number, because the mean of its divisors is an integer number (1946428).

Almost surely, 2^18407225 is an apocalyptic number.

It is an amenable number.

18407225 is a deficient number, since it is larger than the sum of its proper divisors (4949911).

18407225 is a wasteful number, since it uses less digits than its factorization.

18407225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17176 (or 17171 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 18407225 is about 4290.3642036545. The cubic root of 18407225 is about 264.0357743455.

The spelling of 18407225 in words is "eighteen million, four hundred seven thousand, two hundred twenty-five".