18125866 has 8 divisors (see below), whose sum is σ = 29660544. Its totient is φ = 8239020.

The previous prime is 18125857. The next prime is 18125897. The reversal of 18125866 is 66852181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 411930 + ... + 411973.

It is an arithmetic number, because the mean of its divisors is an integer number (3707568).

Almost surely, 2^18125866 is an apocalyptic number.

18125866 is a deficient number, since it is larger than the sum of its proper divisors (11534678).

18125866 is a wasteful number, since it uses less digits than its factorization.

18125866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823916.

The product of its digits is 23040, while the sum is 37.

The square root of 18125866 is about 4257.4482968088. The cubic root of 18125866 is about 262.6835771048.

The spelling of 18125866 in words is "eighteen million, one hundred twenty-five thousand, eight hundred sixty-six".