42145523 has 16 divisors (see below), whose sum is σ = 49950720. Its totient is φ = 34797600.

The previous prime is 42145513. The next prime is 42145541. The reversal of 42145523 is 32554124.

It is a happy number.

42145523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 42145523 - 2⁴ = 42145507 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42145492 and 42145501.

It is not an unprimeable number, because it can be changed into a prime (42145513) 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 15 ways as a sum of consecutive naturals, for example, 77633 + ... + 78173.

It is an arithmetic number, because the mean of its divisors is an integer number (3121920).

Almost surely, 2^42145523 is an apocalyptic number.

42145523 is a deficient number, since it is larger than the sum of its proper divisors (7805197).

42145523 is a wasteful number, since it uses less digits than its factorization.

42145523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938.

The product of its digits is 4800, while the sum is 26.

The square root of 42145523 is about 6491.9583331996. The cubic root of 42145523 is about 348.0036634793.

Adding to 42145523 its reverse (32554124), we get a palindrome (74699647).

The spelling of 42145523 in words is "forty-two million, one hundred forty-five thousand, five hundred twenty-three".