13439555840 has 144 divisors (see below), whose sum is σ = 33730905600. Its totient is φ = 5123629056.

The previous prime is 13439555839. The next prime is 13439555863. The reversal of 13439555840 is 4855593431.

It is a super-2 number, since 2×13439555840² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2930189 + ... + 2934771.

It is an arithmetic number, because the mean of its divisors is an integer number (234242400).

Almost surely, 2^13439555840 is an apocalyptic number.

13439555840 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 13439555840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16865452800).

13439555840 is an abundant number, since it is smaller than the sum of its proper divisors (20291349760).

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

13439555840 is an equidigital number, since it uses as much as digits as its factorization.

13439555840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4712 (or 4698 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 47.

The spelling of 13439555840 in words is "thirteen billion, four hundred thirty-nine million, five hundred fifty-five thousand, eight hundred forty".