13591987 has 8 divisors (see below), whose sum is σ = 14033552. Its totient is φ = 13154400.

The previous prime is 13591969. The next prime is 13592003. The reversal of 13591987 is 78919531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13591987 - 2¹⁵ = 13559219 is a prime.

It is a super-2 number, since 2×13591987² = 369484221216338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13591927) 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, 6937 + ... + 8677.

It is an arithmetic number, because the mean of its divisors is an integer number (1754194).

Almost surely, 2^13591987 is an apocalyptic number.

13591987 is a deficient number, since it is larger than the sum of its proper divisors (441565).

13591987 is a wasteful number, since it uses less digits than its factorization.

13591987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1989.

The product of its digits is 68040, while the sum is 43.

The square root of 13591987 is about 3686.7312079944. The cubic root of 13591987 is about 238.6497498578.

The spelling of 13591987 in words is "thirteen million, five hundred ninety-one thousand, nine hundred eighty-seven".