42009841 has 2 divisors, whose sum is σ = 42009842. Its totient is φ = 42009840.

The previous prime is 42009823. The next prime is 42009853. The reversal of 42009841 is 14890024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41977441 + 32400 = 6479^2 + 180^2 .

It is a cyclic number.

It is not a de Polignac number, because 42009841 - 2⁵ = 42009809 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42009241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21004920 + 21004921.

It is an arithmetic number, because the mean of its divisors is an integer number (21004921).

Almost surely, 2^42009841 is an apocalyptic number.

It is an amenable number.

42009841 is a deficient number, since it is larger than the sum of its proper divisors (1).

42009841 is an equidigital number, since it uses as much as digits as its factorization.

42009841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 42009841 is about 6481.4999035717. The cubic root of 42009841 is about 347.6298112401.

Adding to 42009841 its reverse (14890024), we get a palindrome (56899865).

It can be divided in two parts, 4200 and 9841, that added together give a palindrome (14041).

The spelling of 42009841 in words is "forty-two million, nine thousand, eight hundred forty-one".