1982709 has 6 divisors (see below), whose sum is σ = 2863926. Its totient is φ = 1321800.

The previous prime is 1982681. The next prime is 1982713. The reversal of 1982709 is 9072891.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1830609 + 152100 = 1353^2 + 390^2 .

It is not a de Polignac number, because 1982709 - 2¹¹ = 1980661 is a prime.

It is a super-2 number, since 2×1982709² = 7862269957362, which contains 22 as substring.

It is a Curzon number.

1982709 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1982779) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 110142 + ... + 110159.

It is an arithmetic number, because the mean of its divisors is an integer number (477321).

2^1982709 is an apocalyptic number.

It is an amenable number.

1982709 is a deficient number, since it is larger than the sum of its proper divisors (881217).

1982709 is a wasteful number, since it uses less digits than its factorization.

1982709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220307 (or 220304 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 1982709 is about 1408.0870001530. The cubic root of 1982709 is about 125.6279653269.

It can be divided in two parts, 19 and 82709, that added together give a palindrome (82728).

The spelling of 1982709 in words is "one million, nine hundred eighty-two thousand, seven hundred nine".