42644779 has 2 divisors, whose sum is σ = 42644780. Its totient is φ = 42644778.

The previous prime is 42644741. The next prime is 42644803. The reversal of 42644779 is 97744624.

42644779 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 is a cyclic number.

It is not a de Polignac number, because 42644779 - 2¹⁷ = 42513707 is a prime.

It is not a weakly prime, because it can be changed into another prime (42644479) 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, 21322389 + 21322390.

It is an arithmetic number, because the mean of its divisors is an integer number (21322390).

Almost surely, 2^42644779 is an apocalyptic number.

42644779 is a deficient number, since it is larger than the sum of its proper divisors (1).

42644779 is an equidigital number, since it uses as much as digits as its factorization.

42644779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 43.

The square root of 42644779 is about 6530.2970070281. The cubic root of 42644779 is about 349.3724236804.

The spelling of 42644779 in words is "forty-two million, six hundred forty-four thousand, seven hundred seventy-nine".