42139893 has 8 divisors (see below), whose sum is σ = 56432800. Its totient is φ = 27970128.

The previous prime is 42139879. The next prime is 42139897. The reversal of 42139893 is 39893124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42139893 - 2⁶ = 42139829 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 29983 + ... + 31356.

It is an arithmetic number, because the mean of its divisors is an integer number (7054100).

Almost surely, 2^42139893 is an apocalyptic number.

It is an amenable number.

42139893 is a deficient number, since it is larger than the sum of its proper divisors (14292907).

42139893 is a wasteful number, since it uses less digits than its factorization.

42139893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61571.

The product of its digits is 46656, while the sum is 39.

The square root of 42139893 is about 6491.5247053370. The cubic root of 42139893 is about 347.9881667928.

The spelling of 42139893 in words is "forty-two million, one hundred thirty-nine thousand, eight hundred ninety-three".