13857387208 has 128 divisors (see below), whose sum is σ = 33429957120. Its totient is φ = 5245194240.

The previous prime is 13857387197. The next prime is 13857387281. The reversal of 13857387208 is 80278375831.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1154518 + ... + 1166458.

It is an arithmetic number, because the mean of its divisors is an integer number (261171540).

Almost surely, 2^13857387208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13857387208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16714978560).

13857387208 is an abundant number, since it is smaller than the sum of its proper divisors (19572569912).

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

13857387208 is a wasteful number, since it uses less digits than its factorization.

13857387208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12047 (or 12043 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 52.

The spelling of 13857387208 in words is "thirteen billion, eight hundred fifty-seven million, three hundred eighty-seven thousand, two hundred eight".