6405939539 has 2 divisors, whose sum is σ = 6405939540. Its totient is φ = 6405939538.

The previous prime is 6405939523. The next prime is 6405939557. The reversal of 6405939539 is 9359395046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6405939539 - 2⁴ = 6405939523 is a prime.

It is a super-2 number, since 2×6405939539² = 82072122754647065042, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (6405939569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3202969769 + 3202969770.

It is an arithmetic number, because the mean of its divisors is an integer number (3202969770).

Almost surely, 2^6405939539 is an apocalyptic number.

6405939539 is a deficient number, since it is larger than the sum of its proper divisors (1).

6405939539 is an equidigital number, since it uses as much as digits as its factorization.

6405939539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3936600, while the sum is 53.

The square root of 6405939539 is about 80037.1135099211. The cubic root of 6405939539 is about 1857.2097078999.

The spelling of 6405939539 in words is "six billion, four hundred five million, nine hundred thirty-nine thousand, five hundred thirty-nine".