42805172 has 24 divisors (see below), whose sum is σ = 78059520. Its totient is φ = 20515680.

The previous prime is 42805151. The next prime is 42805181. The reversal of 42805172 is 27150824.

42805172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 11933 + ... + 15099.

It is an arithmetic number, because the mean of its divisors is an integer number (3252480).

Almost surely, 2^42805172 is an apocalyptic number.

It is an amenable number.

42805172 is a deficient number, since it is larger than the sum of its proper divisors (35254348).

42805172 is a wasteful number, since it uses less digits than its factorization.

42805172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3311 (or 3309 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 42805172 is about 6542.5661632115. The cubic root of 42805172 is about 349.8098885916.

Adding to 42805172 its reverse (27150824), we get a palindrome (69955996).

The spelling of 42805172 in words is "forty-two million, eight hundred five thousand, one hundred seventy-two".