1686996 has 18 divisors (see below), whose sum is σ = 4264442. Its totient is φ = 562320.

The previous prime is 1686983. The next prime is 1687009. The reversal of 1686996 is 6996861.

It is an interprime number because it is at equal distance from previous prime (1686983) and next prime (1687009).

It can be written as a sum of positive squares in only one way, i.e., 1368900 + 318096 = 1170^2 + 564^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 23395 + ... + 23466.

2^1686996 is an apocalyptic number.

It is an amenable number.

1686996 is an abundant number, since it is smaller than the sum of its proper divisors (2577446).

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

1686996 is a wasteful number, since it uses less digits than its factorization.

1686996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46871 (or 46866 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 1686996 is about 1298.8441014995. The cubic root of 1686996 is about 119.0432251229.

The spelling of 1686996 in words is "one million, six hundred eighty-six thousand, nine hundred ninety-six".