18839893881 has 16 divisors (see below), whose sum is σ = 25708658624. Its totient is φ = 12265634304.

The previous prime is 18839893871. The next prime is 18839893939.

18839893881 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 18839893881 - 2³⁴ = 1660024697 is a prime.

It is a super-2 number, since 2×18839893881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18839893861) 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, 1025085 + ... + 1043301.

It is an arithmetic number, because the mean of its divisors is an integer number (1606791164).

Almost surely, 2^18839893881 is an apocalyptic number.

It is an amenable number.

18839893881 is a deficient number, since it is larger than the sum of its proper divisors (6868764743).

18839893881 is a wasteful number, since it uses less digits than its factorization.

18839893881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26280.

The product of its digits is 23887872, while the sum is 66.

The spelling of 18839893881 in words is "eighteen billion, eight hundred thirty-nine million, eight hundred ninety-three thousand, eight hundred eighty-one".