6403739 has 2 divisors, whose sum is σ = 6403740. Its totient is φ = 6403738.

The previous prime is 6403723. The next prime is 6403757. The reversal of 6403739 is 9373046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6403739 - 2⁴ = 6403723 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6403769) 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, 3201869 + 3201870.

It is an arithmetic number, because the mean of its divisors is an integer number (3201870).

Almost surely, 2^6403739 is an apocalyptic number.

6403739 is a deficient number, since it is larger than the sum of its proper divisors (1).

6403739 is an equidigital number, since it uses as much as digits as its factorization.

6403739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 32.

The square root of 6403739 is about 2530.5610049947. The cubic root of 6403739 is about 185.6997023488.

The spelling of 6403739 in words is "six million, four hundred three thousand, seven hundred thirty-nine".