42644579 has 2 divisors, whose sum is σ = 42644580. Its totient is φ = 42644578.

The previous prime is 42644573. The next prime is 42644593. The reversal of 42644579 is 97544624.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42644579 - 2²⁴ = 25867363 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a plaindrome in base 12.

It is not a weakly prime, because it can be changed into another prime (42644573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21322289 + 21322290.

It is an arithmetic number, because the mean of its divisors is an integer number (21322290).

Almost surely, 2^42644579 is an apocalyptic number.

42644579 is a deficient number, since it is larger than the sum of its proper divisors (1).

42644579 is an equidigital number, since it uses as much as digits as its factorization.

42644579 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 41.

The square root of 42644579 is about 6530.2816937710. The cubic root of 42644579 is about 349.3718775049.

The spelling of 42644579 in words is "forty-two million, six hundred forty-four thousand, five hundred seventy-nine".