1680507986 has 8 divisors (see below), whose sum is σ = 2521346940. Its totient is φ = 840059008.

The previous prime is 1680507947. The next prime is 1680507989. The reversal of 1680507986 is 6897050861.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1367890225 + 312617761 = 36985^2 + 17681^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1680507989) by changing a digit.

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, 86471 + ... + 104106.

Almost surely, 2^1680507986 is an apocalyptic number.

1680507986 is a deficient number, since it is larger than the sum of its proper divisors (840838954).

1680507986 is a wasteful number, since it uses less digits than its factorization.

1680507986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194988.

The product of its (nonzero) digits is 725760, while the sum is 50.

The square root of 1680507986 is about 40993.9993901547. Note that the first 3 decimals coincide. The cubic root of 1680507986 is about 1188.9041970946.

Adding to 1680507986 its sum of digits (50), we get a square (1680508036 = 40994²).

The spelling of 1680507986 in words is "one billion, six hundred eighty million, five hundred seven thousand, nine hundred eighty-six".