42842139 has 4 divisors (see below), whose sum is σ = 57122856. Its totient is φ = 28561424.

The previous prime is 42842117. The next prime is 42842141. The reversal of 42842139 is 93124824.

42842139 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 a de Polignac number, because none of the positive numbers 2^k-42842139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42842339) 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, 7140354 + ... + 7140359.

It is an arithmetic number, because the mean of its divisors is an integer number (14280714).

Almost surely, 2^42842139 is an apocalyptic number.

42842139 is a deficient number, since it is larger than the sum of its proper divisors (14280717).

42842139 is a wasteful number, since it uses less digits than its factorization.

42842139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14280716.

The product of its digits is 13824, while the sum is 33.

The square root of 42842139 is about 6545.3906682489. The cubic root of 42842139 is about 349.9105594588.

The spelling of 42842139 in words is "forty-two million, eight hundred forty-two thousand, one hundred thirty-nine".