426646439 has 2 divisors, whose sum is σ = 426646440. Its totient is φ = 426646438.

The previous prime is 426646427. The next prime is 426646453. The reversal of 426646439 is 934646624.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-426646439 is a prime.

It is a super-2 number, since 2×426646439² = 364054367822761442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 426646439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426642439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213323219 + 213323220.

It is an arithmetic number, because the mean of its divisors is an integer number (213323220).

Almost surely, 2^426646439 is an apocalyptic number.

426646439 is a deficient number, since it is larger than the sum of its proper divisors (1).

426646439 is an equidigital number, since it uses as much as digits as its factorization.

426646439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 44.

The square root of 426646439 is about 20655.4215401187. The cubic root of 426646439 is about 752.8169260649.

It can be divided in two parts, 4266 and 46439, that added together give a palindrome (50705).

The spelling of 426646439 in words is "four hundred twenty-six million, six hundred forty-six thousand, four hundred thirty-nine".