13487891 has 8 divisors (see below), whose sum is σ = 14308800. Its totient is φ = 12678120.

The previous prime is 13487879. The next prime is 13487899. The reversal of 13487891 is 19878431.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13487891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13487899) 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, 221 + ... + 5198.

It is an arithmetic number, because the mean of its divisors is an integer number (1788600).

Almost surely, 2^13487891 is an apocalyptic number.

13487891 is a deficient number, since it is larger than the sum of its proper divisors (820909).

13487891 is a wasteful number, since it uses less digits than its factorization.

13487891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5569.

The product of its digits is 48384, while the sum is 41.

The square root of 13487891 is about 3672.5864183161. The cubic root of 13487891 is about 238.0389445015.

The spelling of 13487891 in words is "thirteen million, four hundred eighty-seven thousand, eight hundred ninety-one".