6540739 has 2 divisors, whose sum is σ = 6540740. Its totient is φ = 6540738.

The previous prime is 6540719. The next prime is 6540827. The reversal of 6540739 is 9370456.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6540739 is a prime.

It is a super-2 number, since 2×6540739² = 85562533332242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6540719) 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, 3270369 + 3270370.

It is an arithmetic number, because the mean of its divisors is an integer number (3270370).

Almost surely, 2^6540739 is an apocalyptic number.

6540739 is a deficient number, since it is larger than the sum of its proper divisors (1).

6540739 is an equidigital number, since it uses as much as digits as its factorization.

6540739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 6540739 is about 2557.4868523611. The cubic root of 6540739 is about 187.0146403934.

It can be divided in two parts, 65 and 40739, that added together give a palindrome (40804).

The spelling of 6540739 in words is "six million, five hundred forty thousand, seven hundred thirty-nine".