1968749 has 2 divisors, whose sum is σ = 1968750. Its totient is φ = 1968748.

The previous prime is 1968739. The next prime is 1968751. The reversal of 1968749 is 9478691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1357225 + 611524 = 1165^2 + 782^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1968749 is a prime.

It is a Sophie Germain prime.

Together with 1968751, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1968739) 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 as a sum of consecutive naturals, namely, 984374 + 984375.

It is an arithmetic number, because the mean of its divisors is an integer number (984375).

2^1968749 is an apocalyptic number.

It is an amenable number.

1968749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1968749 is an equidigital number, since it uses as much as digits as its factorization.

1968749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 1968749 is about 1403.1211636919. The cubic root of 1968749 is about 125.3324271538.

The spelling of 1968749 in words is "one million, nine hundred sixty-eight thousand, seven hundred forty-nine".