42173879 has 4 divisors (see below), whose sum is σ = 46007880. Its totient is φ = 38339880.

The previous prime is 42173861. The next prime is 42173893. The reversal of 42173879 is 97837124.

42173879 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42173879 - 2⁸ = 42173623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42173819) 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 3 ways as a sum of consecutive naturals, for example, 1916984 + ... + 1917005.

It is an arithmetic number, because the mean of its divisors is an integer number (11501970).

Almost surely, 2^42173879 is an apocalyptic number.

42173879 is a deficient number, since it is larger than the sum of its proper divisors (3834001).

42173879 is a wasteful number, since it uses less digits than its factorization.

42173879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3834000.

The product of its digits is 84672, while the sum is 41.

The square root of 42173879 is about 6494.1418986653. The cubic root of 42173879 is about 348.0816929583.

The spelling of 42173879 in words is "forty-two million, one hundred seventy-three thousand, eight hundred seventy-nine".