8971987 has 4 divisors (see below), whose sum is σ = 8978400. Its totient is φ = 8965576.

The previous prime is 8971979. The next prime is 8972023. The reversal of 8971987 is 7891798.

8971987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 8971987 - 2³ = 8971979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8971987.

It is not an unprimeable number, because it can be changed into a prime (8971687) 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, 112 + ... + 4237.

It is an arithmetic number, because the mean of its divisors is an integer number (2244600).

Almost surely, 2^8971987 is an apocalyptic number.

8971987 is a deficient number, since it is larger than the sum of its proper divisors (6413).

8971987 is a wasteful number, since it uses less digits than its factorization.

8971987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6412.

The product of its digits is 254016, while the sum is 49.

The square root of 8971987 is about 2995.3275280009. The cubic root of 8971987 is about 207.7923454590.

The spelling of 8971987 in words is "eight million, nine hundred seventy-one thousand, nine hundred eighty-seven".