6915987 has 18 divisors (see below), whose sum is σ = 10819692. Its totient is φ = 4255056.

The previous prime is 6915983. The next prime is 6916001. The reversal of 6915987 is 7895196.

It is not a de Polignac number, because 6915987 - 2² = 6915983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6915983) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 753 + ... + 3794.

It is an arithmetic number, because the mean of its divisors is an integer number (601094).

Almost surely, 2^6915987 is an apocalyptic number.

6915987 is a deficient number, since it is larger than the sum of its proper divisors (3903705).

6915987 is a wasteful number, since it uses less digits than its factorization.

6915987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4579 (or 4563 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 6915987 is about 2629.8264201274. The cubic root of 6915987 is about 190.5247451684.

The spelling of 6915987 in words is "six million, nine hundred fifteen thousand, nine hundred eighty-seven".