42135123 has 4 divisors (see below), whose sum is σ = 56180168. Its totient is φ = 28090080.

The previous prime is 42135113. The next prime is 42135127. The reversal of 42135123 is 32153124.

42135123 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 not a de Polignac number, because 42135123 - 2¹² = 42131027 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42135123.

It is not an unprimeable number, because it can be changed into a prime (42135127) 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, 7022518 + ... + 7022523.

It is an arithmetic number, because the mean of its divisors is an integer number (14045042).

Almost surely, 2^42135123 is an apocalyptic number.

42135123 is a deficient number, since it is larger than the sum of its proper divisors (14045045).

42135123 is a wasteful number, since it uses less digits than its factorization.

42135123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14045044.

The product of its digits is 720, while the sum is 21.

The square root of 42135123 is about 6491.1572928100. The cubic root of 42135123 is about 347.9750361931.

Adding to 42135123 its reverse (32153124), we get a palindrome (74288247).

The spelling of 42135123 in words is "forty-two million, one hundred thirty-five thousand, one hundred twenty-three".