13947287 has 4 divisors (see below), whose sum is σ = 13978800. Its totient is φ = 13915776.

The previous prime is 13947281. The next prime is 13947299. The reversal of 13947287 is 78274931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13947287 - 2²² = 9752983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13947281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15083 + ... + 15980.

It is an arithmetic number, because the mean of its divisors is an integer number (3494700).

Almost surely, 2^13947287 is an apocalyptic number.

13947287 is a deficient number, since it is larger than the sum of its proper divisors (31513).

13947287 is an equidigital number, since it uses as much as digits as its factorization.

13947287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31512.

The product of its digits is 84672, while the sum is 41.

The square root of 13947287 is about 3734.6066727301. The cubic root of 13947287 is about 240.7113559053.

The spelling of 13947287 in words is "thirteen million, nine hundred forty-seven thousand, two hundred eighty-seven".