42500905 has 4 divisors (see below), whose sum is σ = 51001092. Its totient is φ = 34000720.

The previous prime is 42500893. The next prime is 42500923. The reversal of 42500905 is 50900524.

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 27008809 + 15492096 = 5197^2 + 3936^2 .

It is not a de Polignac number, because 42500905 - 2⁵ = 42500873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42500905.

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, 4250086 + ... + 4250095.

It is an arithmetic number, because the mean of its divisors is an integer number (12750273).

Almost surely, 2^42500905 is an apocalyptic number.

It is an amenable number.

42500905 is a deficient number, since it is larger than the sum of its proper divisors (8500187).

42500905 is an equidigital number, since it uses as much as digits as its factorization.

42500905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8500186.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 42500905 is about 6519.2718151646. The cubic root of 42500905 is about 348.9790793775.

The spelling of 42500905 in words is "forty-two million, five hundred thousand, nine hundred five".