6985987 has 4 divisors (see below), whose sum is σ = 7003080. Its totient is φ = 6968896.

The previous prime is 6985981. The next prime is 6986011. The reversal of 6985987 is 7895896.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6985987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6985981) 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, 7918 + ... + 8755.

It is an arithmetic number, because the mean of its divisors is an integer number (1750770).

Almost surely, 2^6985987 is an apocalyptic number.

6985987 is a deficient number, since it is larger than the sum of its proper divisors (17093).

6985987 is a wasteful number, since it uses less digits than its factorization.

6985987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17092.

The product of its digits is 1088640, while the sum is 52.

The square root of 6985987 is about 2643.1017763227. The cubic root of 6985987 is about 191.1653858402.

Subtracting 6985987 from its reverse (7895896), we obtain a palindrome (909909).

The spelling of 6985987 in words is "six million, nine hundred eighty-five thousand, nine hundred eighty-seven".