18692861838 has 64 divisors (see below), whose sum is σ = 43480074240. Its totient is φ = 5246841600.

The previous prime is 18692861809. The next prime is 18692861851. The reversal of 18692861838 is 83816829681.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2329978 + ... + 2337986.

It is an arithmetic number, because the mean of its divisors is an integer number (679376160).

Almost surely, 2^18692861838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18692861838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21740037120).

18692861838 is an abundant number, since it is smaller than the sum of its proper divisors (24787212402).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18692861838 is a wasteful number, since it uses less digits than its factorization.

18692861838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8993.

The product of its digits is 7962624, while the sum is 60.

The spelling of 18692861838 in words is "eighteen billion, six hundred ninety-two million, eight hundred sixty-one thousand, eight hundred thirty-eight".