42008505 has 64 divisors (see below), whose sum is σ = 86151168. Its totient is φ = 16968960.

The previous prime is 42008497. The next prime is 42008537. The reversal of 42008505 is 50580024.

It is not a de Polignac number, because 42008505 - 2³ = 42008497 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 42244 + ... + 43226.

It is an arithmetic number, because the mean of its divisors is an integer number (1346112).

Almost surely, 2^42008505 is an apocalyptic number.

It is an amenable number.

42008505 is an abundant number, since it is smaller than the sum of its proper divisors (44142663).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42008505 is a wasteful number, since it uses less digits than its factorization.

42008505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1046.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 42008505 is about 6481.3968401881. The cubic root of 42008505 is about 347.6261260849.

Adding to 42008505 its reverse (50580024), we get a palindrome (92588529).

The spelling of 42008505 in words is "forty-two million, eight thousand, five hundred five".