42139859 has 4 divisors (see below), whose sum is σ = 42383616. Its totient is φ = 41896104.

The previous prime is 42139829. The next prime is 42139879. The reversal of 42139859 is 95893124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42139859 - 2¹² = 42135763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42139829) 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, 121619 + ... + 121964.

It is an arithmetic number, because the mean of its divisors is an integer number (10595904).

Almost surely, 2^42139859 is an apocalyptic number.

42139859 is a deficient number, since it is larger than the sum of its proper divisors (243757).

42139859 is a wasteful number, since it uses less digits than its factorization.

42139859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243756.

The product of its digits is 77760, while the sum is 41.

The square root of 42139859 is about 6491.5220865372. The cubic root of 42139859 is about 347.9880732029.

The spelling of 42139859 in words is "forty-two million, one hundred thirty-nine thousand, eight hundred fifty-nine".