18838938837 has 16 divisors (see below), whose sum is σ = 25286734592. Its totient is φ = 12475270080.

The previous prime is 18838938823. The next prime is 18838938871. The reversal of 18838938837 is 73883983881.

It is a happy number.

It is not a de Polignac number, because 18838938837 - 2¹¹ = 18838936789 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 (18838938737) 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, 2429787 + ... + 2437527.

It is an arithmetic number, because the mean of its divisors is an integer number (1580420912).

Almost surely, 2^18838938837 is an apocalyptic number.

It is an amenable number.

18838938837 is a deficient number, since it is larger than the sum of its proper divisors (6447795755).

18838938837 is a wasteful number, since it uses less digits than its factorization.

18838938837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13068.

The product of its digits is 55738368, while the sum is 66.

The spelling of 18838938837 in words is "eighteen billion, eight hundred thirty-eight million, nine hundred thirty-eight thousand, eight hundred thirty-seven".