18478225 has 12 divisors (see below), whose sum is σ = 23126620. Its totient is φ = 14644800.

The previous prime is 18478217. The next prime is 18478231. The reversal of 18478225 is 52287481.

It can be written as a sum of positive squares in 6 ways, for example, as 99856 + 18378369 = 316^2 + 4287^2 .

It is not a de Polignac number, because 18478225 - 2³ = 18478217 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 666 + ... + 6115.

Almost surely, 2^18478225 is an apocalyptic number.

It is an amenable number.

18478225 is a deficient number, since it is larger than the sum of its proper divisors (4648395).

18478225 is a wasteful number, since it uses less digits than its factorization.

18478225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6900 (or 6895 counting only the distinct ones).

The product of its digits is 35840, while the sum is 37.

The square root of 18478225 is about 4298.6305958991. The cubic root of 18478225 is about 264.3748167335.

The spelling of 18478225 in words is "eighteen million, four hundred seventy-eight thousand, two hundred twenty-five".