1920078409 has 2 divisors, whose sum is σ = 1920078410. Its totient is φ = 1920078408.

The previous prime is 1920078373. The next prime is 1920078437. The reversal of 1920078409 is 9048700291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1290821184 + 629257225 = 35928^2 + 25085^2 .

It is a cyclic number.

It is not a de Polignac number, because 1920078409 - 2¹⁹ = 1919554121 is a prime.

It is not a weakly prime, because it can be changed into another prime (1920078469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960039204 + 960039205.

It is an arithmetic number, because the mean of its divisors is an integer number (960039205).

Almost surely, 2^1920078409 is an apocalyptic number.

It is an amenable number.

1920078409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1920078409 is an equidigital number, since it uses as much as digits as its factorization.

1920078409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 1920078409 is about 43818.6993074874. The cubic root of 1920078409 is about 1242.9099212480.

The spelling of 1920078409 in words is "one billion, nine hundred twenty million, seventy-eight thousand, four hundred nine".