921982 has 4 divisors (see below), whose sum is σ = 1382976. Its totient is φ = 460990.

The previous prime is 921959. The next prime is 921989. The reversal of 921982 is 289129.

921982 is nontrivially palindromic in base 5.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 921982.

It is not an unprimeable number, because it can be changed into a prime (921989) by changing a digit.

921982 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 (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 230494 + ... + 230497.

It is an arithmetic number, because the mean of its divisors is an integer number (345744).

2⁹²¹⁹⁸² is an apocalyptic number.

921982 is a deficient number, since it is larger than the sum of its proper divisors (460994).

921982 is a wasteful number, since it uses less digits than its factorization.

921982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460993.

The product of its digits is 2592, while the sum is 31.

The square root of 921982 is about 960.1989377207. The cubic root of 921982 is about 97.3286756805.

The spelling of 921982 in words is "nine hundred twenty-one thousand, nine hundred eighty-two".