1680786 has 12 divisors (see below), whose sum is σ = 3641742. Its totient is φ = 560256.

The previous prime is 1680779. The next prime is 1680787. The reversal of 1680786 is 6870861.

It can be written as a sum of positive squares in only one way, i.e., 1010025 + 670761 = 1005^2 + 819^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1680786.

It is not an unprimeable number, because it can be changed into a prime (1680787) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46671 + ... + 46706.

2^1680786 is an apocalyptic number.

1680786 is an abundant number, since it is smaller than the sum of its proper divisors (1960956).

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

1680786 is a wasteful number, since it uses less digits than its factorization.

1680786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93385 (or 93382 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 1680786 is about 1296.4513103083. The cubic root of 1680786 is about 118.8969755404.

The spelling of 1680786 in words is "one million, six hundred eighty thousand, seven hundred eighty-six".