8443987 has 4 divisors (see below), whose sum is σ = 8449936. Its totient is φ = 8438040.

The previous prime is 8443969. The next prime is 8443993. The reversal of 8443987 is 7893448.

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 a de Polignac number, because none of the positive numbers 2^k-8443987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8443927) 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, 538 + ... + 4144.

It is an arithmetic number, because the mean of its divisors is an integer number (2112484).

Almost surely, 2^8443987 is an apocalyptic number.

8443987 is a deficient number, since it is larger than the sum of its proper divisors (5949).

8443987 is a wasteful number, since it uses less digits than its factorization.

8443987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5948.

The product of its digits is 193536, while the sum is 43.

The square root of 8443987 is about 2905.8539192465. The cubic root of 8443987 is about 203.6334809969.

The spelling of 8443987 in words is "eight million, four hundred forty-three thousand, nine hundred eighty-seven".