42129623 has 4 divisors (see below), whose sum is σ = 42211008. Its totient is φ = 42048240.

The previous prime is 42129559. The next prime is 42129641. The reversal of 42129623 is 32692124.

42129623 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 a cyclic number.

It is not a de Polignac number, because 42129623 - 2⁶ = 42129559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42129653) 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, 39911 + ... + 40952.

It is an arithmetic number, because the mean of its divisors is an integer number (10552752).

Almost surely, 2^42129623 is an apocalyptic number.

42129623 is a deficient number, since it is larger than the sum of its proper divisors (81385).

42129623 is an equidigital number, since it uses as much as digits as its factorization.

42129623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81384.

The product of its digits is 5184, while the sum is 29.

The square root of 42129623 is about 6490.7336257160. The cubic root of 42129623 is about 347.9598948586.

The spelling of 42129623 in words is "forty-two million, one hundred twenty-nine thousand, six hundred twenty-three".