13447987 has 8 divisors (see below), whose sum is σ = 15580256. Its totient is φ = 11368512.

The previous prime is 13447963. The next prime is 13447997. The reversal of 13447987 is 78974431.

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 13447987 - 2⁷ = 13447859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13447927) 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 7 ways as a sum of consecutive naturals, for example, 12648 + ... + 13669.

It is an arithmetic number, because the mean of its divisors is an integer number (1947532).

Almost surely, 2^13447987 is an apocalyptic number.

13447987 is a deficient number, since it is larger than the sum of its proper divisors (2132269).

13447987 is an equidigital number, since it uses as much as digits as its factorization.

13447987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26397.

The product of its digits is 169344, while the sum is 43.

The square root of 13447987 is about 3667.1497106063. The cubic root of 13447987 is about 237.8039661101.

The spelling of 13447987 in words is "thirteen million, four hundred forty-seven thousand, nine hundred eighty-seven".