42142505 has 4 divisors (see below), whose sum is σ = 50571012. Its totient is φ = 33714000.

The previous prime is 42142489. The next prime is 42142511. The reversal of 42142505 is 50524124.

It is a happy number.

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 24870169 + 17272336 = 4987^2 + 4156^2 .

It is not a de Polignac number, because 42142505 - 2⁴ = 42142489 is a prime.

It is a Duffinian number.

It is a Curzon 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, 4214246 + ... + 4214255.

It is an arithmetic number, because the mean of its divisors is an integer number (12642753).

Almost surely, 2^42142505 is an apocalyptic number.

It is an amenable number.

42142505 is a deficient number, since it is larger than the sum of its proper divisors (8428507).

42142505 is an equidigital number, since it uses as much as digits as its factorization.

42142505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8428506.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 42142505 is about 6491.7258876203. The cubic root of 42142505 is about 347.9953565461.

Adding to 42142505 its reverse (50524124), we get a palindrome (92666629).

The spelling of 42142505 in words is "forty-two million, one hundred forty-two thousand, five hundred five".