42044813 has 2 divisors, whose sum is σ = 42044814. Its totient is φ = 42044812.

The previous prime is 42044801. The next prime is 42044833. The reversal of 42044813 is 31844024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27741289 + 14303524 = 5267^2 + 3782^2 .

It is a cyclic number.

It is not a de Polignac number, because 42044813 - 2⁶ = 42044749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42044833) 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, 21022406 + 21022407.

It is an arithmetic number, because the mean of its divisors is an integer number (21022407).

Almost surely, 2^42044813 is an apocalyptic number.

It is an amenable number.

42044813 is a deficient number, since it is larger than the sum of its proper divisors (1).

42044813 is an equidigital number, since it uses as much as digits as its factorization.

42044813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 42044813 is about 6484.1971746701. The cubic root of 42044813 is about 347.7262484676.

Adding to 42044813 its reverse (31844024), we get a palindrome (73888837).

The spelling of 42044813 in words is "forty-two million, forty-four thousand, eight hundred thirteen".