42868139 has 4 divisors (see below), whose sum is σ = 42884856. Its totient is φ = 42851424.

The previous prime is 42868121. The next prime is 42868171. The reversal of 42868139 is 93186824.

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 42868139 - 2²⁰ = 41819563 is a prime.

It is a super-3 number, since 3×42868139³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42868096 and 42868105.

It is not an unprimeable number, because it can be changed into a prime (42868439) 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, 3614 + ... + 9939.

It is an arithmetic number, because the mean of its divisors is an integer number (10721214).

Almost surely, 2^42868139 is an apocalyptic number.

42868139 is a deficient number, since it is larger than the sum of its proper divisors (16717).

42868139 is a wasteful number, since it uses less digits than its factorization.

42868139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16716.

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

The square root of 42868139 is about 6547.3764974988. The cubic root of 42868139 is about 349.9813296163.

The spelling of 42868139 in words is "forty-two million, eight hundred sixty-eight thousand, one hundred thirty-nine".