1968641 has 2 divisors, whose sum is σ = 1968642. Its totient is φ = 1968640.

The previous prime is 1968613. The next prime is 1968679. The reversal of 1968641 is 1468691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1210000 + 758641 = 1100^2 + 871^2 .

It is a cyclic number.

It is not a de Polignac number, because 1968641 - 2¹⁴ = 1952257 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1968611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984320 + 984321.

It is an arithmetic number, because the mean of its divisors is an integer number (984321).

2^1968641 is an apocalyptic number.

It is an amenable number.

1968641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1968641 is an equidigital number, since it uses as much as digits as its factorization.

1968641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 35.

The square root of 1968641 is about 1403.0826775354. The cubic root of 1968641 is about 125.3301353178.

The spelling of 1968641 in words is "one million, nine hundred sixty-eight thousand, six hundred forty-one".