18398639894042 has 32 divisors (see below), whose sum is σ = 27815146200000. Its totient is φ = 9127072814976.

The previous prime is 18398639894029. The next prime is 18398639894101. The reversal of 18398639894042 is 24049893689381.

It is a Smith number, since the sum of its digits (74) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1069120334 + ... + 1069137542.

It is an arithmetic number, because the mean of its divisors is an integer number (869223318750).

Almost surely, 2^{18398639894042} is an apocalyptic number.

18398639894042 is a deficient number, since it is larger than the sum of its proper divisors (9416506305958).

18398639894042 is a wasteful number, since it uses less digits than its factorization.

18398639894042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21278.

The product of its (nonzero) digits is 644972544, while the sum is 74.

The spelling of 18398639894042 in words is "eighteen trillion, three hundred ninety-eight billion, six hundred thirty-nine million, eight hundred ninety-four thousand, forty-two".