2587986 has 24 divisors (see below), whose sum is σ = 5701644. Its totient is φ = 848160.

The previous prime is 2587979. The next prime is 2587993. The reversal of 2587986 is 6897852.

It is an interprime number because it is at equal distance from previous prime (2587979) and next prime (2587993).

It can be written as a sum of positive squares in 2 ways, for example, as 2047761 + 540225 = 1431^2 + 735^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81 + ... + 2276.

2^2587986 is an apocalyptic number.

2587986 is an abundant number, since it is smaller than the sum of its proper divisors (3113658).

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

2587986 is a wasteful number, since it uses less digits than its factorization.

2587986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2426 (or 2423 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 2587986 is about 1608.7218529006. The cubic root of 2587986 is about 137.2947637837.

The spelling of 2587986 in words is "two million, five hundred eighty-seven thousand, nine hundred eighty-six".