42805815 has 16 divisors (see below), whose sum is σ = 73758048. Its totient is φ = 21073536.

The previous prime is 42805811. The next prime is 42805817. The reversal of 42805815 is 51850824.

42805815 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42805815 - 2² = 42805811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42805811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109564 + ... + 109953.

It is an arithmetic number, because the mean of its divisors is an integer number (4609878).

Almost surely, 2^42805815 is an apocalyptic number.

42805815 is a deficient number, since it is larger than the sum of its proper divisors (30952233).

42805815 is a wasteful number, since it uses less digits than its factorization.

42805815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219538.

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 42805815 is about 6542.6153027669. The cubic root of 42805815 is about 349.8116401450.

The spelling of 42805815 in words is "forty-two million, eight hundred five thousand, eight hundred fifteen".