1668841 has 4 divisors (see below), whose sum is σ = 1672272. Its totient is φ = 1665412.

The previous prime is 1668833. The next prime is 1668847. The reversal of 1668841 is 1488661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1668841 - 2³ = 1668833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1668797 and 1668806.

It is not an unprimeable number, because it can be changed into a prime (1668847) 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, 835 + ... + 2008.

It is an arithmetic number, because the mean of its divisors is an integer number (418068).

2^1668841 is an apocalyptic number.

It is an amenable number.

1668841 is a deficient number, since it is larger than the sum of its proper divisors (3431).

1668841 is an equidigital number, since it uses as much as digits as its factorization.

1668841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3430.

The product of its digits is 9216, while the sum is 34.

The square root of 1668841 is about 1291.8362899377. The cubic root of 1668841 is about 118.6146468891.

The spelling of 1668841 in words is "one million, six hundred sixty-eight thousand, eight hundred forty-one".