42205505 has 4 divisors (see below), whose sum is σ = 50646612. Its totient is φ = 33764400.

The previous prime is 42205481. The next prime is 42205547. The reversal of 42205505 is 50550224.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19775809 + 22429696 = 4447^2 + 4736^2 .

It is a de Polignac number, because none of the positive numbers 2^k-42205505 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4220546 + ... + 4220555.

It is an arithmetic number, because the mean of its divisors is an integer number (12661653).

Almost surely, 2^42205505 is an apocalyptic number.

It is an amenable number.

42205505 is a deficient number, since it is larger than the sum of its proper divisors (8441107).

42205505 is an equidigital number, since it uses as much as digits as its factorization.

42205505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8441106.

The product of its (nonzero) digits is 2000, while the sum is 23.

The square root of 42205505 is about 6496.5764060773. The cubic root of 42205505 is about 348.1686795110.

Adding to 42205505 its reverse (50550224), we get a palindrome (92755729).

The spelling of 42205505 in words is "forty-two million, two hundred five thousand, five hundred five".