991393344 has 140 divisors (see below), whose sum is σ = 2954643824. Its totient is φ = 330044544.

The previous prime is 991393303. The next prime is 991393367. The reversal of 991393344 is 443393199.

991393344 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 991393344.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1259319 + ... + 1260105.

Almost surely, 2^991393344 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991393344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1477321912).

991393344 is an abundant number, since it is smaller than the sum of its proper divisors (1963250480).

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

991393344 is an frugal number, since it uses more digits than its factorization.

991393344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826 (or 792 counting only the distinct ones).

The product of its digits is 314928, while the sum is 45.

The square root of 991393344 is about 31486.3993495604. The cubic root of 991393344 is about 997.1228445824.

The spelling of 991393344 in words is "nine hundred ninety-one million, three hundred ninety-three thousand, three hundred forty-four".