42105023 has 4 divisors (see below), whose sum is σ = 42254088. Its totient is φ = 41955960.

The previous prime is 42104983. The next prime is 42105031. The reversal of 42105023 is 32050124.

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 42105023 - 2¹⁴ = 42088639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42104992 and 42105010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42105053) 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, 74108 + ... + 74673.

It is an arithmetic number, because the mean of its divisors is an integer number (10563522).

Almost surely, 2^42105023 is an apocalyptic number.

42105023 is a deficient number, since it is larger than the sum of its proper divisors (149065).

42105023 is a wasteful number, since it uses less digits than its factorization.

42105023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149064.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 42105023 is about 6488.8383397955. The cubic root of 42105023 is about 347.8921556654.

Adding to 42105023 its reverse (32050124), we get a palindrome (74155147).

The spelling of 42105023 in words is "forty-two million, one hundred five thousand, twenty-three".