1982665 has 4 divisors (see below), whose sum is σ = 2379204. Its totient is φ = 1586128.

The previous prime is 1982641. The next prime is 1982671. The reversal of 1982665 is 5662891.

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

It can be written as a sum of positive squares in 2 ways, for example, as 861184 + 1121481 = 928^2 + 1059^2 .

It is a cyclic number.

It is not a de Polignac number, because 1982665 - 2⁵ = 1982633 is a prime.

It is a super-3 number, since 3×1982665³ = 23381333412431788875, which contains 333 as substring.

It is a Duffinian number.

1982665 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198262 + ... + 198271.

It is an arithmetic number, because the mean of its divisors is an integer number (594801).

2^1982665 is an apocalyptic number.

It is an amenable number.

1982665 is a deficient number, since it is larger than the sum of its proper divisors (396539).

1982665 is an equidigital number, since it uses as much as digits as its factorization.

1982665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396538.

The product of its digits is 25920, while the sum is 37.

The square root of 1982665 is about 1408.0713760318. The cubic root of 1982665 is about 125.6270360140.

It can be divided in two parts, 19826 and 65, that added together give a palindrome (19891).

The spelling of 1982665 in words is "one million, nine hundred eighty-two thousand, six hundred sixty-five".