18249818 has 16 divisors (see below), whose sum is σ = 28166400. Its totient is φ = 8864016.

The previous prime is 18249817. The next prime is 18249841. The reversal of 18249818 is 81894281.

It is not an unprimeable number, because it can be changed into a prime (18249811) 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, 13355 + ... + 14657.

It is an arithmetic number, because the mean of its divisors is an integer number (1760400).

Almost surely, 2^18249818 is an apocalyptic number.

18249818 is a deficient number, since it is larger than the sum of its proper divisors (9916582).

18249818 is a wasteful number, since it uses less digits than its factorization.

18249818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501.

The product of its digits is 36864, while the sum is 41.

The square root of 18249818 is about 4271.9805711169. The cubic root of 18249818 is about 263.2809962038.

The spelling of 18249818 in words is "eighteen million, two hundred forty-nine thousand, eight hundred eighteen".