13871697920 has 78 divisors (see below), whose sum is σ = 33328507338. Its totient is φ = 5541937152.

The previous prime is 13871697871. The next prime is 13871697941. The reversal of 13871697920 is 2979617831.

It can be written as a sum of positive squares in only one way, i.e., 11097358336 + 2774339584 = 105344^2 + 52672^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16854629 + ... + 16855451.

Almost surely, 2^13871697920 is an apocalyptic number.

13871697920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13871697920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16664253669).

13871697920 is an abundant number, since it is smaller than the sum of its proper divisors (19456809418).

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

13871697920 is an frugal number, since it uses more digits than its factorization.

13871697920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1675 (or 830 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 53.

The spelling of 13871697920 in words is "thirteen billion, eight hundred seventy-one million, six hundred ninety-seven thousand, nine hundred twenty".