1968689 has 4 divisors (see below), whose sum is σ = 2010624. Its totient is φ = 1926756.

The previous prime is 1968683. The next prime is 1968691. The reversal of 1968689 is 9868691.

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 1968689 - 2¹² = 1964593 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 41887 = 1968689 / (1 + 9 + 6 + 8 + 6 + 8 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1968683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20897 + ... + 20990.

It is an arithmetic number, because the mean of its divisors is an integer number (502656).

2^1968689 is an apocalyptic number.

It is an amenable number.

1968689 is a deficient number, since it is larger than the sum of its proper divisors (41935).

1968689 is an equidigital number, since it uses as much as digits as its factorization.

1968689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41934.

The product of its digits is 186624, while the sum is 47.

The square root of 1968689 is about 1403.0997826242. The cubic root of 1968689 is about 125.3311539219.

The spelling of 1968689 in words is "one million, nine hundred sixty-eight thousand, six hundred eighty-nine".