1686986 has 16 divisors (see below), whose sum is σ = 2963520. Its totient is φ = 705120.

The previous prime is 1686983. The next prime is 1687009. The reversal of 1686986 is 6896861.

It is not an unprimeable number, because it can be changed into a prime (1686983) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 896 + ... + 2043.

It is an arithmetic number, because the mean of its divisors is an integer number (185220).

2^1686986 is an apocalyptic number.

1686986 is a deficient number, since it is larger than the sum of its proper divisors (1276534).

1686986 is a wasteful number, since it uses less digits than its factorization.

1686986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2989.

The product of its digits is 124416, while the sum is 44.

The square root of 1686986 is about 1298.8402519171. The cubic root of 1686986 is about 119.0429899051.

The spelling of 1686986 in words is "one million, six hundred eighty-six thousand, nine hundred eighty-six".