987986 has 4 divisors (see below), whose sum is σ = 1481982. Its totient is φ = 493992.

The previous prime is 987983. The next prime is 987991. The reversal of 987986 is 689789.

987986 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.

It can be written as a sum of positive squares in only one way, i.e., 664225 + 323761 = 815^2 + 569^2 .

It is a super-2 number, since 2×987986² = 1952232672392, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 987986.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 987986.

It is not an unprimeable number, because it can be changed into a prime (987983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 246995 + ... + 246998.

2⁹⁸⁷⁹⁸⁶ is an apocalyptic number.

987986 is a deficient number, since it is larger than the sum of its proper divisors (493996).

987986 is a wasteful number, since it uses less digits than its factorization.

987986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493995.

The product of its digits is 217728, while the sum is 47.

The square root of 987986 is about 993.9748487764. The cubic root of 987986 is about 99.5979188073.

The spelling of 987986 in words is "nine hundred eighty-seven thousand, nine hundred eighty-six".