42173123 has 4 divisors (see below), whose sum is σ = 42707040. Its totient is φ = 41639208.

The previous prime is 42173111. The next prime is 42173129. The reversal of 42173123 is 32137124.

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 42173123 - 2⁶ = 42173059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42173129) 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, 266840 + ... + 266997.

It is an arithmetic number, because the mean of its divisors is an integer number (10676760).

Almost surely, 2^42173123 is an apocalyptic number.

42173123 is a deficient number, since it is larger than the sum of its proper divisors (533917).

42173123 is an equidigital number, since it uses as much as digits as its factorization.

42173123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533916.

The product of its digits is 1008, while the sum is 23.

The square root of 42173123 is about 6494.0836921001. The cubic root of 42173123 is about 348.0796130664.

The spelling of 42173123 in words is "forty-two million, one hundred seventy-three thousand, one hundred twenty-three".