426642439 has 2 divisors, whose sum is σ = 426642440. Its totient is φ = 426642438.

The previous prime is 426642427. The next prime is 426642481. The reversal of 426642439 is 934246624.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 426642439 - 2¹¹ = 426640391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426642409) 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, 213321219 + 213321220.

It is an arithmetic number, because the mean of its divisors is an integer number (213321220).

Almost surely, 2^426642439 is an apocalyptic number.

426642439 is a deficient number, since it is larger than the sum of its proper divisors (1).

426642439 is an equidigital number, since it uses as much as digits as its factorization.

426642439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 40.

The square root of 426642439 is about 20655.3247130129. The cubic root of 426642439 is about 752.8145733931.

The spelling of 426642439 in words is "four hundred twenty-six million, six hundred forty-two thousand, four hundred thirty-nine".