Search a number
1982 = 2991

1982 has 4 divisors (see below), whose sum is σ = 2976. Its totient is φ = 990.

The previous prime is 1979. The next prime is 1987. The reversal of 1982 is 2891.

1982 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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

1982 is strictly pandigital in base 5.

It is a plaindrome in base 16.

It is a nialpdrome in base 7 and base 13.

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 1982.

It is not an unprimeable number, because it can be changed into a prime (1987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494 + ... + 497.

It is an arithmetic number, because the mean of its divisors is an integer number (744).

1982 is a deficient number, since it is larger than the sum of its proper divisors (994).

1982 is an equidigital number, since it uses as much as digits as its factorization.

1982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993.

The product of its digits is 144, while the sum is 20.

The square root of 1982 is about 44.5196585791. The cubic root of 1982 is about 12.5612989042.

Adding to 1982 its sum of digits (20), we get a palindrome (2002).

Subtracting 1982 from its reverse (2891), we obtain a palindrome (909).

It can be divided in two parts, 19 and 82, that added together give a palindrome (101).

The spelling of 1982 in words is "one thousand, nine hundred eighty-two".

Divisors: 1 2 991 1982