42878243 has 4 divisors (see below), whose sum is σ = 42891480. Its totient is φ = 42865008.

The previous prime is 42878201. The next prime is 42878261. The reversal of 42878243 is 34287824.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 42878243 - 2⁸ = 42877987 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42878197 and 42878206.

It is not an unprimeable number, because it can be changed into a prime (42878263) by changing a digit.

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, 1871 + ... + 9447.

It is an arithmetic number, because the mean of its divisors is an integer number (10722870).

Almost surely, 2^42878243 is an apocalyptic number.

42878243 is a deficient number, since it is larger than the sum of its proper divisors (13237).

42878243 is an equidigital number, since it uses as much as digits as its factorization.

42878243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13236.

The product of its digits is 86016, while the sum is 38.

The square root of 42878243 is about 6548.1480588026. The cubic root of 42878243 is about 350.0088242673.

The spelling of 42878243 in words is "forty-two million, eight hundred seventy-eight thousand, two hundred forty-three".