42644389 has 2 divisors, whose sum is σ = 42644390. Its totient is φ = 42644388.

The previous prime is 42644333. The next prime is 42644411. The reversal of 42644389 is 98344624.

42644389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29920900 + 12723489 = 5470^2 + 3567^2 .

It is a cyclic number.

It is not a de Polignac number, because 42644389 - 2¹³ = 42636197 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 (42644689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21322194 + 21322195.

It is an arithmetic number, because the mean of its divisors is an integer number (21322195).

Almost surely, 2^42644389 is an apocalyptic number.

It is an amenable number.

42644389 is a deficient number, since it is larger than the sum of its proper divisors (1).

42644389 is an equidigital number, since it uses as much as digits as its factorization.

42644389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 40.

The square root of 42644389 is about 6530.2671461434. The cubic root of 42644389 is about 349.3713586367.

The spelling of 42644389 in words is "forty-two million, six hundred forty-four thousand, three hundred eighty-nine".