2159986 has 24 divisors (see below), whose sum is σ = 3569796. Its totient is φ = 979200.

The previous prime is 2159959. The next prime is 2160001. The reversal of 2159986 is 6899512.

2159986 is digitally balanced in base 2, 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 6 ways, for example, as 2157961 + 2025 = 1469^2 + 45^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21336 + ... + 21436.

2^2159986 is an apocalyptic number.

2159986 is a deficient number, since it is larger than the sum of its proper divisors (1409810).

2159986 is a wasteful number, since it uses less digits than its factorization.

2159986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174 (or 157 counting only the distinct ones).

The product of its digits is 38880, while the sum is 40.

The square root of 2159986 is about 1469.6890827655. The cubic root of 2159986 is about 129.2658021227.

It can be divided in two parts, 215 and 9986, that added together give a palindrome (10201).

The spelling of 2159986 in words is "two million, one hundred fifty-nine thousand, nine hundred eighty-six".