18766225 has 12 divisors (see below), whose sum is σ = 23327500. Its totient is φ = 14976000.

The previous prime is 18766211. The next prime is 18766303. The reversal of 18766225 is 52266781.

It is a happy number.

It is a Cunningham number, because it is equal to 4332²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 1 + 18766224 = 1^2 + 4332^2 .

It is not a de Polignac number, because 18766225 - 2⁹ = 18765713 is a prime.

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, 14401 + ... + 15649.

Almost surely, 2^18766225 is an apocalyptic number.

It is an amenable number.

18766225 is a deficient number, since it is larger than the sum of its proper divisors (4561275).

18766225 is a wasteful number, since it uses less digits than its factorization.

18766225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1860 (or 1855 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The square root of 18766225 is about 4332.0001154201. Note that the first 3 decimals coincide. The cubic root of 18766225 is about 265.7412496931.

The spelling of 18766225 in words is "eighteen million, seven hundred sixty-six thousand, two hundred twenty-five".