13847987 has 4 divisors (see below), whose sum is σ = 13855560. Its totient is φ = 13840416.

The previous prime is 13847983. The next prime is 13848007. The reversal of 13847987 is 78974831.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13847987 - 2² = 13847983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13847983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 848 + ... + 5330.

It is an arithmetic number, because the mean of its divisors is an integer number (3463890).

Almost surely, 2^13847987 is an apocalyptic number.

13847987 is a deficient number, since it is larger than the sum of its proper divisors (7573).

13847987 is an equidigital number, since it uses as much as digits as its factorization.

13847987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7572.

The product of its digits is 338688, while the sum is 47.

The square root of 13847987 is about 3721.2883521705. The cubic root of 13847987 is about 240.1387334463.

The spelling of 13847987 in words is "thirteen million, eight hundred forty-seven thousand, nine hundred eighty-seven".