13639200987 has 6 divisors (see below), whose sum is σ = 18185871028. Its totient is φ = 9092665804.

The previous prime is 13639200979. The next prime is 13639200989. The reversal of 13639200987 is 78900293631.

It is not a de Polignac number, because 13639200987 - 2³ = 13639200979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13639200989) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 168568 + ... + 235994.

Almost surely, 2^13639200987 is an apocalyptic number.

13639200987 is a deficient number, since it is larger than the sum of its proper divisors (4546670041).

13639200987 is an frugal number, since it uses more digits than its factorization.

13639200987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134857 (or 67430 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 48.

Multiplying 13639200987 by its sum of digits (48), we get a square (654681647376 = 809124²).

The spelling of 13639200987 in words is "thirteen billion, six hundred thirty-nine million, two hundred thousand, nine hundred eighty-seven".