42139892 has 12 divisors (see below), whose sum is σ = 75738180. Its totient is φ = 20500416.

The previous prime is 42139879. The next prime is 42139897. The reversal of 42139892 is 29893124.

It can be written as a sum of positive squares in 2 ways, for example, as 20106256 + 22033636 = 4484^2 + 4694^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42139897) 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, 142217 + ... + 142512.

It is an arithmetic number, because the mean of its divisors is an integer number (6311515).

Almost surely, 2^42139892 is an apocalyptic number.

It is an amenable number.

42139892 is a deficient number, since it is larger than the sum of its proper divisors (33598288).

42139892 is a wasteful number, since it uses less digits than its factorization.

42139892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284770 (or 284768 counting only the distinct ones).

The product of its digits is 31104, while the sum is 38.

The square root of 42139892 is about 6491.5246283134. The cubic root of 42139892 is about 347.9881640401.

The spelling of 42139892 in words is "forty-two million, one hundred thirty-nine thousand, eight hundred ninety-two".