991682 has 8 divisors (see below), whose sum is σ = 1501500. Its totient is φ = 491184.

The previous prime is 991663. The next prime is 991693. The reversal of 991682 is 286199.

It can be written as a sum of positive squares in 2 ways, for example, as 942841 + 48841 = 971^2 + 221^2 .

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

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 991682.

It is an unprimeable number.

991682 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2057 + ... + 2492.

2⁹⁹¹⁶⁸² is an apocalyptic number.

991682 is a deficient number, since it is larger than the sum of its proper divisors (509818).

991682 is a wasteful number, since it uses less digits than its factorization.

991682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4660.

The product of its digits is 7776, while the sum is 35.

The square root of 991682 is about 995.8323152017. The cubic root of 991682 is about 99.7219609929.

The spelling of 991682 in words is "nine hundred ninety-one thousand, six hundred eighty-two".