13889836820 has 12 divisors (see below), whose sum is σ = 29168657364. Its totient is φ = 5555934720.

The previous prime is 13889836819. The next prime is 13889836879. The reversal of 13889836820 is 2863898831.

It can be written as a sum of positive squares in 2 ways, for example, as 10185653776 + 3704183044 = 100924^2 + 60862^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347245901 + ... + 347245940.

It is an arithmetic number, because the mean of its divisors is an integer number (2430721447).

Almost surely, 2^13889836820 is an apocalyptic number.

13889836820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13889836820 is an abundant number, since it is smaller than the sum of its proper divisors (15278820544).

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

13889836820 is a wasteful number, since it uses less digits than its factorization.

13889836820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694491850 (or 694491848 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 56.

The spelling of 13889836820 in words is "thirteen billion, eight hundred eighty-nine million, eight hundred thirty-six thousand, eight hundred twenty".