1686612 has 12 divisors (see below), whose sum is σ = 3935456. Its totient is φ = 562200.

The previous prime is 1686593. The next prime is 1686631. The reversal of 1686612 is 2166861.

It is an interprime number because it is at equal distance from previous prime (1686593) and next prime (1686631).

It is a tau number, because it is divible by the number of its divisors (12).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1686612.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 70264 + ... + 70287.

2^1686612 is an apocalyptic number.

1686612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1686612 is an abundant number, since it is smaller than the sum of its proper divisors (2248844).

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

1686612 is a wasteful number, since it uses less digits than its factorization.

1686612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140558 (or 140556 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 1686612 is about 1298.6962693409. The cubic root of 1686612 is about 119.0341920908.

Subtracting 1686612 from its reverse (2166861), we obtain a square (480249 = 693²).

The spelling of 1686612 in words is "one million, six hundred eighty-six thousand, six hundred twelve".