1999841 has 6 divisors (see below), whose sum is σ = 2067426. Its totient is φ = 1934400.

The previous prime is 1999819. The next prime is 1999853. The reversal of 1999841 is 1489991.

It can be written as a sum of positive squares in only one way, i.e., 1615441 + 384400 = 1271^2 + 620^2 .

It is not a de Polignac number, because 1999841 - 2¹⁰ = 1998817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1999871) 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, 80 + ... + 2001.

It is an arithmetic number, because the mean of its divisors is an integer number (344571).

2^1999841 is an apocalyptic number.

It is an amenable number.

1999841 is a deficient number, since it is larger than the sum of its proper divisors (67585).

1999841 is an equidigital number, since it uses as much as digits as its factorization.

1999841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2143 (or 2112 counting only the distinct ones).

The product of its digits is 23328, while the sum is 41.

The square root of 1999841 is about 1414.1573462667. The cubic root of 1999841 is about 125.9887661102.

It can be divided in two parts, 19998 and 41, that multiplied together give a palindrome (819918).

The spelling of 1999841 in words is "one million, nine hundred ninety-nine thousand, eight hundred forty-one".