42115123 has 4 divisors (see below), whose sum is σ = 42128320. Its totient is φ = 42101928.

The previous prime is 42115121. The next prime is 42115127. The reversal of 42115123 is 32151124.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 42115123 - 2¹ = 42115121 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 42115123.

It is not an unprimeable number, because it can be changed into a prime (42115121) 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, 1513 + ... + 9301.

It is an arithmetic number, because the mean of its divisors is an integer number (10532080).

Almost surely, 2^42115123 is an apocalyptic number.

42115123 is a deficient number, since it is larger than the sum of its proper divisors (13197).

42115123 is an equidigital number, since it uses as much as digits as its factorization.

42115123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13196.

The product of its digits is 240, while the sum is 19.

The square root of 42115123 is about 6489.6165526170. The cubic root of 42115123 is about 347.9199704771.

Adding to 42115123 its reverse (32151124), we get a palindrome (74266247).

The spelling of 42115123 in words is "forty-two million, one hundred fifteen thousand, one hundred twenty-three".