42188005 has 4 divisors (see below), whose sum is σ = 50625612. Its totient is φ = 33750400.

The previous prime is 42187997. The next prime is 42188017. The reversal of 42188005 is 50088124.

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 24740676 + 17447329 = 4974^2 + 4177^2 .

It is not a de Polignac number, because 42188005 - 2³ = 42187997 is a prime.

It is a Duffinian number.

It is a congruent 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, 4218796 + ... + 4218805.

It is an arithmetic number, because the mean of its divisors is an integer number (12656403).

Almost surely, 2^42188005 is an apocalyptic number.

It is an amenable number.

42188005 is a deficient number, since it is larger than the sum of its proper divisors (8437607).

42188005 is an equidigital number, since it uses as much as digits as its factorization.

42188005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8437606.

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 42188005 is about 6495.2294031851. The cubic root of 42188005 is about 348.1205515539.

The spelling of 42188005 in words is "forty-two million, one hundred eighty-eight thousand, five".