6400242439 has 2 divisors, whose sum is σ = 6400242440. Its totient is φ = 6400242438.

The previous prime is 6400242413. The next prime is 6400242449. The reversal of 6400242439 is 9342420046.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6400242439 - 2¹¹ = 6400240391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6400242449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3200121219 + 3200121220.

It is an arithmetic number, because the mean of its divisors is an integer number (3200121220).

Almost surely, 2^6400242439 is an apocalyptic number.

6400242439 is a deficient number, since it is larger than the sum of its proper divisors (1).

6400242439 is an equidigital number, since it uses as much as digits as its factorization.

6400242439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 6400242439 is about 80001.5152294005. The cubic root of 6400242439 is about 1856.6589769440.

The spelling of 6400242439 in words is "six billion, four hundred million, two hundred forty-two thousand, four hundred thirty-nine".