991304 has 32 divisors (see below), whose sum is σ = 2031480. Its totient is φ = 451584.

The previous prime is 991273. The next prime is 991313. The reversal of 991304 is 403199.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 902500 + 88804 = 950^2 + 298^2 .

It is a plaindrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 991304.

It is an unprimeable number.

991304 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4934 + ... + 5130.

2⁹⁹¹³⁰⁴ is an apocalyptic number.

It is an amenable number.

991304 is an abundant number, since it is smaller than the sum of its proper divisors (1040176).

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

991304 is a wasteful number, since it uses less digits than its factorization.

991304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257 (or 253 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 991304 is about 995.6425061236. The cubic root of 991304 is about 99.7092890236.

The spelling of 991304 in words is "nine hundred ninety-one thousand, three hundred four".