18709418 has 32 divisors (see below), whose sum is σ = 36578304. Its totient is φ = 6964992.

The previous prime is 18709417. The next prime is 18709447. The reversal of 18709418 is 81490781.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (18709417) 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, 71 + ... + 6117.

It is an arithmetic number, because the mean of its divisors is an integer number (1143072).

Almost surely, 2^18709418 is an apocalyptic number.

18709418 is a deficient number, since it is larger than the sum of its proper divisors (17868886).

18709418 is a wasteful number, since it uses less digits than its factorization.

18709418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6086.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 18709418 is about 4325.4384748832. The cubic root of 18709418 is about 265.4728380279.

The spelling of 18709418 in words is "eighteen million, seven hundred nine thousand, four hundred eighteen".