18818718 has 32 divisors (see below), whose sum is σ = 39077376. Its totient is φ = 6036768.

The previous prime is 18818707. The next prime is 18818719. The reversal of 18818718 is 81781881.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18818718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18818719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22455 + ... + 23277.

It is an arithmetic number, because the mean of its divisors is an integer number (1221168).

Almost surely, 2^18818718 is an apocalyptic number.

18818718 is an abundant number, since it is smaller than the sum of its proper divisors (20258658).

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

18818718 is a wasteful number, since it uses less digits than its factorization.

18818718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968.

The product of its digits is 28672, while the sum is 42.

The square root of 18818718 is about 4338.0546331276. The cubic root of 18818718 is about 265.9887967091.

The spelling of 18818718 in words is "eighteen million, eight hundred eighteen thousand, seven hundred eighteen".