426644389 has 2 divisors, whose sum is σ = 426644390. Its totient is φ = 426644388.

The previous prime is 426644377. The next prime is 426644453. The reversal of 426644389 is 983446624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 416772225 + 9872164 = 20415^2 + 3142^2 .

It is a cyclic number.

It is not a de Polignac number, because 426644389 - 2⁷ = 426644261 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426644369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213322194 + 213322195.

It is an arithmetic number, because the mean of its divisors is an integer number (213322195).

Almost surely, 2^426644389 is an apocalyptic number.

It is an amenable number.

426644389 is a deficient number, since it is larger than the sum of its proper divisors (1).

426644389 is an equidigital number, since it uses as much as digits as its factorization.

426644389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995328, while the sum is 46.

The square root of 426644389 is about 20655.3719162837. The cubic root of 426644389 is about 752.8157203224.

The spelling of 426644389 in words is "four hundred twenty-six million, six hundred forty-four thousand, three hundred eighty-nine".