18646225 has 12 divisors (see below), whose sum is σ = 24900316. Its totient is φ = 13769280.

The previous prime is 18646211. The next prime is 18646231. The reversal of 18646225 is 52264681.

It can be written as a sum of positive squares in 6 ways, for example, as 61504 + 18584721 = 248^2 + 4311^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18646225 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

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, 28362 + ... + 29011.

Almost surely, 2^18646225 is an apocalyptic number.

It is an amenable number.

18646225 is a deficient number, since it is larger than the sum of its proper divisors (6254091).

18646225 is a wasteful number, since it uses less digits than its factorization.

18646225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57396 (or 57391 counting only the distinct ones).

The product of its digits is 23040, while the sum is 34.

The square root of 18646225 is about 4318.1274876965. The cubic root of 18646225 is about 265.1736135381.

The spelling of 18646225 in words is "eighteen million, six hundred forty-six thousand, two hundred twenty-five".