42879 has 4 divisors (see below), whose sum is σ = 57176. Its totient is φ = 28584.

The previous prime is 42863. The next prime is 42899. The reversal of 42879 is 97824.

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

It is not a de Polignac number, because 42879 - 2⁴ = 42863 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 8 and base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42829) 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, 7144 + ... + 7149.

It is an arithmetic number, because the mean of its divisors is an integer number (14294).

2⁴²⁸⁷⁹ is an apocalyptic number.

42879 is a deficient number, since it is larger than the sum of its proper divisors (14297).

42879 is a wasteful number, since it uses less digits than its factorization.

42879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14296.

The product of its digits is 4032, while the sum is 30.

The square root of 42879 is about 207.0724510890. The cubic root of 42879 is about 35.0010884015.

Subtracting from 42879 its sum of digits (30), we obtain a square (42849 = 207²).

Subtracting 42879 from its reverse (97824), we obtain a palindrome (54945).

It can be divided in two parts, 4287 and 9, that multiplied together give a palindrome (38583).

The spelling of 42879 in words is "forty-two thousand, eight hundred seventy-nine".