18625218 has 16 divisors (see below), whose sum is σ = 37292736. Its totient is φ = 6201360.

The previous prime is 18625153. The next prime is 18625219. The reversal of 18625218 is 81252681.

It is not an unprimeable number, because it can be changed into a prime (18625219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9555 + ... + 11337.

It is an arithmetic number, because the mean of its divisors is an integer number (2330796).

Almost surely, 2^18625218 is an apocalyptic number.

18625218 is an abundant number, since it is smaller than the sum of its proper divisors (18667518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18625218 is a wasteful number, since it uses less digits than its factorization.

18625218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3529.

The product of its digits is 7680, while the sum is 33.

The square root of 18625218 is about 4315.6943821360. The cubic root of 18625218 is about 265.0739938147.

Adding to 18625218 its reverse (81252681), we get a palindrome (99877899).

The spelling of 18625218 in words is "eighteen million, six hundred twenty-five thousand, two hundred eighteen".