42752139 has 4 divisors (see below), whose sum is σ = 57002856. Its totient is φ = 28501424.

The previous prime is 42752117. The next prime is 42752173. The reversal of 42752139 is 93125724.

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 42752139 - 2⁹ = 42751627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42754139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7125354 + ... + 7125359.

It is an arithmetic number, because the mean of its divisors is an integer number (14250714).

Almost surely, 2^42752139 is an apocalyptic number.

42752139 is a deficient number, since it is larger than the sum of its proper divisors (14250717).

42752139 is a wasteful number, since it uses less digits than its factorization.

42752139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14250716.

The product of its digits is 15120, while the sum is 33.

The square root of 42752139 is about 6538.5119866832. The cubic root of 42752139 is about 349.6653645102.

The spelling of 42752139 in words is "forty-two million, seven hundred fifty-two thousand, one hundred thirty-nine".