7987686 has 48 divisors (see below), whose sum is σ = 18837360. Its totient is φ = 2251200.

The previous prime is 7987669. The next prime is 7987687. The reversal of 7987686 is 6867897.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7987687) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29560 + ... + 29828.

It is an arithmetic number, because the mean of its divisors is an integer number (392445).

Almost surely, 2^7987686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7987686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9418680).

7987686 is an abundant number, since it is smaller than the sum of its proper divisors (10849674).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7987686 is a wasteful number, since it uses less digits than its factorization.

7987686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389 (or 382 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 51.

The square root of 7987686 is about 2826.2494582043. The cubic root of 7987686 is about 199.8973306374.

The spelling of 7987686 in words is "seven million, nine hundred eighty-seven thousand, six hundred eighty-six".