42139868 has 12 divisors (see below), whose sum is σ = 73793160. Its totient is φ = 21056112.

The previous prime is 42139829. The next prime is 42139879. The reversal of 42139868 is 86893124.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6755 + ... + 11397.

It is an arithmetic number, because the mean of its divisors is an integer number (6149430).

Almost surely, 2^42139868 is an apocalyptic number.

It is an amenable number.

42139868 is a deficient number, since it is larger than the sum of its proper divisors (31653292).

42139868 is a wasteful number, since it uses less digits than its factorization.

42139868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6916 (or 6914 counting only the distinct ones).

The product of its digits is 82944, while the sum is 41.

The square root of 42139868 is about 6491.5227797490. The cubic root of 42139868 is about 347.9880979767.

The spelling of 42139868 in words is "forty-two million, one hundred thirty-nine thousand, eight hundred sixty-eight".