42428139 has 16 divisors (see below), whose sum is σ = 61958400. Its totient is φ = 25665696.

The previous prime is 42428093. The next prime is 42428147. The reversal of 42428139 is 93182424.

It is not a de Polignac number, because 42428139 - 2⁸ = 42427883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42428339) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6919 + ... + 11520.

It is an arithmetic number, because the mean of its divisors is an integer number (3872400).

Almost surely, 2^42428139 is an apocalyptic number.

42428139 is a deficient number, since it is larger than the sum of its proper divisors (19530261).

42428139 is a wasteful number, since it uses less digits than its factorization.

42428139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18514.

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

The square root of 42428139 is about 6513.6885863541. The cubic root of 42428139 is about 348.7798026971.

The spelling of 42428139 in words is "forty-two million, four hundred twenty-eight thousand, one hundred thirty-nine".