18394391983 has 16 divisors (see below), whose sum is σ = 20118623616. Its totient is φ = 16678902240.

The previous prime is 18394391971. The next prime is 18394391999. The reversal of 18394391983 is 38919349381.

It is not a de Polignac number, because 18394391983 - 2²¹ = 18392294831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18394394983) 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, 12402760 + ... + 12404242.

It is an arithmetic number, because the mean of its divisors is an integer number (1257413976).

Almost surely, 2^18394391983 is an apocalyptic number.

18394391983 is a deficient number, since it is larger than the sum of its proper divisors (1724231633).

18394391983 is a wasteful number, since it uses less digits than its factorization.

18394391983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3654.

The product of its digits is 5038848, while the sum is 58.

The spelling of 18394391983 in words is "eighteen billion, three hundred ninety-four million, three hundred ninety-one thousand, nine hundred eighty-three".