42208505 has 4 divisors (see below), whose sum is σ = 50650212. Its totient is φ = 33766800.

The previous prime is 42208493. The next prime is 42208513. The reversal of 42208505 is 50580224.

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 26296384 + 15912121 = 5128^2 + 3989^2 .

It is not a de Polignac number, because 42208505 - 2⁴ = 42208489 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 4220846 + ... + 4220855.

It is an arithmetic number, because the mean of its divisors is an integer number (12662553).

Almost surely, 2^42208505 is an apocalyptic number.

It is an amenable number.

42208505 is a deficient number, since it is larger than the sum of its proper divisors (8441707).

42208505 is an equidigital number, since it uses as much as digits as its factorization.

42208505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8441706.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 42208505 is about 6496.8072928170. The cubic root of 42208505 is about 348.1769286821.

Adding to 42208505 its reverse (50580224), we get a palindrome (92788729).

The spelling of 42208505 in words is "forty-two million, two hundred eight thousand, five hundred five".