42815705 has 4 divisors (see below), whose sum is σ = 51378852. Its totient is φ = 34252560.

The previous prime is 42815701. The next prime is 42815711. The reversal of 42815705 is 50751824.

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 6911641 + 35904064 = 2629^2 + 5992^2 .

It is not a de Polignac number, because 42815705 - 2² = 42815701 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42815701) 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, 4281566 + ... + 4281575.

It is an arithmetic number, because the mean of its divisors is an integer number (12844713).

Almost surely, 2^42815705 is an apocalyptic number.

It is an amenable number.

42815705 is a deficient number, since it is larger than the sum of its proper divisors (8563147).

42815705 is an equidigital number, since it uses as much as digits as its factorization.

42815705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8563146.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 42815705 is about 6543.3710730785. The cubic root of 42815705 is about 349.8385786245.

The spelling of 42815705 in words is "forty-two million, eight hundred fifteen thousand, seven hundred five".