13897987540 has 24 divisors (see below), whose sum is σ = 29736451080. Its totient is φ = 5454304128.

The previous prime is 13897987531. The next prime is 13897987553. The reversal of 13897987540 is 4578979831.

It can be written as a sum of positive squares in 4 ways, for example, as 3468267664 + 10429719876 = 58892^2 + 102126^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6554595 + ... + 6556714.

It is an arithmetic number, because the mean of its divisors is an integer number (1239018795).

Almost surely, 2^13897987540 is an apocalyptic number.

13897987540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13897987540 is an abundant number, since it is smaller than the sum of its proper divisors (15838463540).

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

13897987540 is a wasteful number, since it uses less digits than its factorization.

13897987540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13111371 (or 13111369 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 61.

The spelling of 13897987540 in words is "thirteen billion, eight hundred ninety-seven million, nine hundred eighty-seven thousand, five hundred forty".