7987986 has 12 divisors (see below), whose sum is σ = 17307342. Its totient is φ = 2662656.

The previous prime is 7987957. The next prime is 7988009. The reversal of 7987986 is 6897897.

7987986 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 7049025 + 938961 = 2655^2 + 969^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 221871 + ... + 221906.

Almost surely, 2^7987986 is an apocalyptic number.

7987986 is an abundant number, since it is smaller than the sum of its proper divisors (9319356).

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

7987986 is a wasteful number, since it uses less digits than its factorization.

7987986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443785 (or 443782 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 54.

The square root of 7987986 is about 2826.3025315773. The cubic root of 7987986 is about 199.8998331747.

The spelling of 7987986 in words is "seven million, nine hundred eighty-seven thousand, nine hundred eighty-six".