42878 has 8 divisors (see below), whose sum is σ = 70200. Its totient is φ = 19480.

The previous prime is 42863. The next prime is 42899. The reversal of 42878 is 87824.

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

It is a plaindrome in base 14.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 42878.

It is a congruent number.

It is an unprimeable number.

42878 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 953 + ... + 996.

It is an arithmetic number, because the mean of its divisors is an integer number (8775).

2⁴²⁸⁷⁸ is an apocalyptic number.

42878 is a deficient number, since it is larger than the sum of its proper divisors (27322).

42878 is a wasteful number, since it uses less digits than its factorization.

42878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1962.

The product of its digits is 3584, while the sum is 29.

The square root of 42878 is about 207.0700364611. The cubic root of 42878 is about 35.0008163075. Note that the first 3 decimals are identical.

Subtracting from 42878 its sum of digits (29), we obtain a square (42849 = 207²).

It can be divided in two parts, 4 and 2878, that added together give a palindrome (2882).

The spelling of 42878 in words is "forty-two thousand, eight hundred seventy-eight".