42278 has 4 divisors (see below), whose sum is σ = 63420. Its totient is φ = 21138.

The previous prime is 42257. The next prime is 42281. The reversal of 42278 is 87224.

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

It is a plaindrome in base 8 and base 14.

It is a congruent number.

It is an unprimeable number.

42278 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 (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10568 + ... + 10571.

It is an arithmetic number, because the mean of its divisors is an integer number (15855).

2⁴²²⁷⁸ is an apocalyptic number.

42278 is a deficient number, since it is larger than the sum of its proper divisors (21142).

42278 is a wasteful number, since it uses less digits than its factorization.

42278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21141.

The product of its digits is 896, while the sum is 23.

The square root of 42278 is about 205.6161472258. The cubic root of 42278 is about 34.8367911425.

The spelling of 42278 in words is "forty-two thousand, two hundred seventy-eight".