1920189893 has 2 divisors, whose sum is σ = 1920189894. Its totient is φ = 1920189892.

The previous prime is 1920189853. The next prime is 1920189919. The reversal of 1920189893 is 3989810291.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1552202404 + 367987489 = 39398^2 + 19183^2 .

It is a cyclic number.

It is not a de Polignac number, because 1920189893 - 2⁶ = 1920189829 is a prime.

It is a Sophie Germain 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 (1920189853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960094946 + 960094947.

It is an arithmetic number, because the mean of its divisors is an integer number (960094947).

Almost surely, 2^1920189893 is an apocalyptic number.

It is an amenable number.

1920189893 is a deficient number, since it is larger than the sum of its proper divisors (1).

1920189893 is an equidigital number, since it uses as much as digits as its factorization.

1920189893 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1920189893 is about 43819.9713943311. The cubic root of 1920189893 is about 1242.9339761490.

The spelling of 1920189893 in words is "one billion, nine hundred twenty million, one hundred eighty-nine thousand, eight hundred ninety-three".