19994618 has 16 divisors (see below), whose sum is σ = 36293184. Its totient is φ = 8064960.

The previous prime is 19994591. The next prime is 19994647. The reversal of 19994618 is 81649991.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41768 + ... + 42243.

It is an arithmetic number, because the mean of its divisors is an integer number (2268324).

Almost surely, 2^19994618 is an apocalyptic number.

19994618 is a deficient number, since it is larger than the sum of its proper divisors (16298566).

19994618 is a wasteful number, since it uses less digits than its factorization.

19994618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84037.

The product of its digits is 139968, while the sum is 47.

The square root of 19994618 is about 4471.5341886203. The cubic root of 19994618 is about 271.4174111491.

The spelling of 19994618 in words is "nineteen million, nine hundred ninety-four thousand, six hundred eighteen".