42639593 has 2 divisors, whose sum is σ = 42639594. Its totient is φ = 42639592.

The previous prime is 42639589. The next prime is 42639643. The reversal of 42639593 is 39593624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27793984 + 14845609 = 5272^2 + 3853^2 .

It is a cyclic number.

It is not a de Polignac number, because 42639593 - 2² = 42639589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42639593.

It is not a weakly prime, because it can be changed into another prime (42639563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21319796 + 21319797.

It is an arithmetic number, because the mean of its divisors is an integer number (21319797).

Almost surely, 2^42639593 is an apocalyptic number.

It is an amenable number.

42639593 is a deficient number, since it is larger than the sum of its proper divisors (1).

42639593 is an equidigital number, since it uses as much as digits as its factorization.

42639593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 41.

The square root of 42639593 is about 6529.8999226634. The cubic root of 42639593 is about 349.3582607990.

The spelling of 42639593 in words is "forty-two million, six hundred thirty-nine thousand, five hundred ninety-three".