1969889 has 2 divisors, whose sum is σ = 1969890. Its totient is φ = 1969888.

The previous prime is 1969831. The next prime is 1969907. The reversal of 1969889 is 9889691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1600225 + 369664 = 1265^2 + 608^2 .

It is a cyclic number.

It is not a de Polignac number, because 1969889 - 2⁸ = 1969633 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1969819) 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, 984944 + 984945.

It is an arithmetic number, because the mean of its divisors is an integer number (984945).

2^1969889 is an apocalyptic number.

It is an amenable number.

1969889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1969889 is an equidigital number, since it uses as much as digits as its factorization.

1969889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 50.

The square root of 1969889 is about 1403.5273420921. The cubic root of 1969889 is about 125.3566136462.

The spelling of 1969889 in words is "one million, nine hundred sixty-nine thousand, eight hundred eighty-nine".