7909778423 has 2 divisors, whose sum is σ = 7909778424. Its totient is φ = 7909778422.

The previous prime is 7909778399. The next prime is 7909778497. The reversal of 7909778423 is 3248779097.

7909778423 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7909778423 - 2⁸ = 7909778167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7909778923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3954889211 + 3954889212.

It is an arithmetic number, because the mean of its divisors is an integer number (3954889212).

Almost surely, 2^7909778423 is an apocalyptic number.

7909778423 is a deficient number, since it is larger than the sum of its proper divisors (1).

7909778423 is an equidigital number, since it uses as much as digits as its factorization.

7909778423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5334336, while the sum is 56.

The square root of 7909778423 is about 88936.9350888595. The cubic root of 7909778423 is about 1992.4530931687.

The spelling of 7909778423 in words is "seven billion, nine hundred nine million, seven hundred seventy-eight thousand, four hundred twenty-three".