13897987538 has 16 divisors (see below), whose sum is σ = 21059305344. Its totient is φ = 6878327280.

The previous prime is 13897987531. The next prime is 13897987553. The reversal of 13897987538 is 83578979831.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (13897987531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237056 + ... + 289812.

It is an arithmetic number, because the mean of its divisors is an integer number (1316206584).

Almost surely, 2^13897987538 is an apocalyptic number.

13897987538 is a deficient number, since it is larger than the sum of its proper divisors (7161317806).

13897987538 is a wasteful number, since it uses less digits than its factorization.

13897987538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54097.

The product of its digits is 91445760, while the sum is 68.

The spelling of 13897987538 in words is "thirteen billion, eight hundred ninety-seven million, nine hundred eighty-seven thousand, five hundred thirty-eight".