1982865 has 16 divisors (see below), whose sum is σ = 3221568. Its totient is φ = 1041216.

The previous prime is 1982861. The next prime is 1982873. The reversal of 1982865 is 5682891.

1982865 is nontrivially palindromic in base 14.

It is not a de Polignac number, because 1982865 - 2² = 1982861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1982861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19 + ... + 1991.

It is an arithmetic number, because the mean of its divisors is an integer number (201348).

2^1982865 is an apocalyptic number.

1982865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1982865 is a deficient number, since it is larger than the sum of its proper divisors (1238703).

1982865 is a wasteful number, since it uses less digits than its factorization.

1982865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2048.

The product of its digits is 34560, while the sum is 39.

The square root of 1982865 is about 1408.1423933679. The cubic root of 1982865 is about 125.6312600529.

The spelling of 1982865 in words is "one million, nine hundred eighty-two thousand, eight hundred sixty-five".