991382 has 16 divisors (see below), whose sum is σ = 1789440. Its totient is φ = 402408.

The previous prime is 991381. The next prime is 991387. The reversal of 991382 is 283199.

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 991382.

It is not an unprimeable number, because it can be changed into a prime (991381) 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, 1598 + ... + 2129.

It is an arithmetic number, because the mean of its divisors is an integer number (111840).

2⁹⁹¹³⁸² is an apocalyptic number.

991382 is a deficient number, since it is larger than the sum of its proper divisors (798058).

991382 is a wasteful number, since it uses less digits than its factorization.

991382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3755.

The product of its digits is 3888, while the sum is 32.

The square root of 991382 is about 995.6816760391. The cubic root of 991382 is about 99.7119041381.

The spelling of 991382 in words is "nine hundred ninety-one thousand, three hundred eighty-two".