991344 has 40 divisors (see below), whose sum is σ = 2698240. Its totient is φ = 312768.

The previous prime is 991343. The next prime is 991357. The reversal of 991344 is 443199.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 991344.

It is not an unprimeable number, because it can be changed into a prime (991343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 369 + ... + 1455.

It is an arithmetic number, because the mean of its divisors is an integer number (67456).

2⁹⁹¹³⁴⁴ 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 991344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1349120).

991344 is an abundant number, since it is smaller than the sum of its proper divisors (1706896).

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

991344 is a wasteful number, since it uses less digits than its factorization.

991344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1117 (or 1111 counting only the distinct ones).

The product of its digits is 3888, while the sum is 30.

The square root of 991344 is about 995.6625934522. The cubic root of 991344 is about 99.7106301251.

The spelling of 991344 in words is "nine hundred ninety-one thousand, three hundred forty-four".