42238505 has 4 divisors (see below), whose sum is σ = 50686212. Its totient is φ = 33790800.

The previous prime is 42238499. The next prime is 42238507. The reversal of 42238505 is 50583224.

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 12503296 + 29735209 = 3536^2 + 5453^2 .

It is not a de Polignac number, because 42238505 - 2⁸ = 42238249 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42238507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4223846 + ... + 4223855.

It is an arithmetic number, because the mean of its divisors is an integer number (12671553).

Almost surely, 2^42238505 is an apocalyptic number.

It is an amenable number.

42238505 is a deficient number, since it is larger than the sum of its proper divisors (8447707).

42238505 is an equidigital number, since it uses as much as digits as its factorization.

42238505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8447706.

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 42238505 is about 6499.1157090792. The cubic root of 42238505 is about 348.2593989026.

The spelling of 42238505 in words is "forty-two million, two hundred thirty-eight thousand, five hundred five".