991208 has 16 divisors (see below), whose sum is σ = 1939680. Its totient is φ = 473968.

The previous prime is 991201. The next prime is 991217. The reversal of 991208 is 802199.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 991208.

It is not an unprimeable number, because it can be changed into a prime (991201) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2510 + ... + 2877.

It is an arithmetic number, because the mean of its divisors is an integer number (121230).

2⁹⁹¹²⁰⁸ is an apocalyptic number.

It is an amenable number.

991208 is a deficient number, since it is larger than the sum of its proper divisors (948472).

991208 is a wasteful number, since it uses less digits than its factorization.

991208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5416 (or 5412 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 991208 is about 995.5942948812. The cubic root of 991208 is about 99.7060702327.

The spelling of 991208 in words is "nine hundred ninety-one thousand, two hundred eight".