18722071839 has 8 divisors (see below), whose sum is σ = 25052881840. Its totient is φ = 12436321536.

The previous prime is 18722071793. The next prime is 18722071847. The reversal of 18722071839 is 93817022781.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18722071839 - 2⁹ = 18722071327 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 (18722072839) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 11263954 + ... + 11265615.

It is an arithmetic number, because the mean of its divisors is an integer number (3131610230).

Almost surely, 2^18722071839 is an apocalyptic number.

18722071839 is a deficient number, since it is larger than the sum of its proper divisors (6330810001).

18722071839 is a wasteful number, since it uses less digits than its factorization.

18722071839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22529849.

The product of its (nonzero) digits is 338688, while the sum is 48.

The spelling of 18722071839 in words is "eighteen billion, seven hundred twenty-two million, seventy-one thousand, eight hundred thirty-nine".