18837921973 has 16 divisors (see below), whose sum is σ = 20641234432. Its totient is φ = 17085816000.

The previous prime is 18837921941. The next prime is 18837922007. The reversal of 18837921973 is 37912973881.

It is a cyclic number.

It is not a de Polignac number, because 18837921973 - 2⁵ = 18837921941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18837922973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 773878 + ... + 797848.

It is an arithmetic number, because the mean of its divisors is an integer number (1290077152).

Almost surely, 2^18837921973 is an apocalyptic number.

18837921973 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18837921973 is a deficient number, since it is larger than the sum of its proper divisors (1803312459).

18837921973 is a wasteful number, since it uses less digits than its factorization.

18837921973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25036.

The product of its digits is 4572288, while the sum is 58.

The spelling of 18837921973 in words is "eighteen billion, eight hundred thirty-seven million, nine hundred twenty-one thousand, nine hundred seventy-three".