42127139 has 4 divisors (see below), whose sum is σ = 44605224. Its totient is φ = 39649056.

The previous prime is 42127133. The next prime is 42127159. The reversal of 42127139 is 93172124.

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-42127139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42127133) 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, 1239017 + ... + 1239050.

It is an arithmetic number, because the mean of its divisors is an integer number (11151306).

Almost surely, 2^42127139 is an apocalyptic number.

42127139 is a deficient number, since it is larger than the sum of its proper divisors (2478085).

42127139 is a wasteful number, since it uses less digits than its factorization.

42127139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2478084.

The product of its digits is 3024, while the sum is 29.

The square root of 42127139 is about 6490.5422731849. The cubic root of 42127139 is about 347.9530560494.

The spelling of 42127139 in words is "forty-two million, one hundred twenty-seven thousand, one hundred thirty-nine".