1982971 has 4 divisors (see below), whose sum is σ = 2003512. Its totient is φ = 1962432.

The previous prime is 1982969. The next prime is 1982987. The reversal of 1982971 is 1792891.

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

It is a cyclic number.

It is not a de Polignac number, because 1982971 - 2¹ = 1982969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1982971.

It is not an unprimeable number, because it can be changed into a prime (1982921) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 10125 + ... + 10318.

It is an arithmetic number, because the mean of its divisors is an integer number (500878).

2^1982971 is an apocalyptic number.

1982971 is a deficient number, since it is larger than the sum of its proper divisors (20541).

1982971 is an equidigital number, since it uses as much as digits as its factorization.

1982971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20540.

The product of its digits is 9072, while the sum is 37.

The square root of 1982971 is about 1408.1800311040. The cubic root of 1982971 is about 125.6334986784.

It can be divided in two parts, 19829 and 71, that added together give a triangular number (19900 = T₁₉₉).

The spelling of 1982971 in words is "one million, nine hundred eighty-two thousand, nine hundred seventy-one".