191982 has 24 divisors (see below), whose sum is σ = 447336. Its totient is φ = 54768.

The previous prime is 191977. The next prime is 191999. The reversal of 191982 is 289191.

191982 is nontrivially palindromic in base 4.

It is a congruent number.

It is an unprimeable number.

191982 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 (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33 + ... + 620.

It is an arithmetic number, because the mean of its divisors is an integer number (18639).

2¹⁹¹⁹⁸² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191982, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223668).

191982 is an abundant number, since it is smaller than the sum of its proper divisors (255354).

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

191982 is a wasteful number, since it uses less digits than its factorization.

191982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672 (or 665 counting only the distinct ones).

The product of its digits is 1296, while the sum is 30.

The square root of 191982 is about 438.1575059268. The cubic root of 191982 is about 57.6881799440.

The spelling of 191982 in words is "one hundred ninety-one thousand, nine hundred eighty-two".