2399438791 has 2 divisors, whose sum is σ = 2399438792. Its totient is φ = 2399438790.

The previous prime is 2399438771. The next prime is 2399438809. The reversal of 2399438791 is 1978349932.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2399438791 - 2⁵ = 2399438759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2399438771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1199719395 + 1199719396.

It is an arithmetic number, because the mean of its divisors is an integer number (1199719396).

Almost surely, 2^2399438791 is an apocalyptic number.

2399438791 is a deficient number, since it is larger than the sum of its proper divisors (1).

2399438791 is an equidigital number, since it uses as much as digits as its factorization.

2399438791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2939328, while the sum is 55.

The square root of 2399438791 is about 48984.0667054094. The cubic root of 2399438791 is about 1338.7615331966.

The spelling of 2399438791 in words is "two billion, three hundred ninety-nine million, four hundred thirty-eight thousand, seven hundred ninety-one".