42442978 has 8 divisors (see below), whose sum is σ = 65145168. Its totient is φ = 20727924.

The previous prime is 42442969. The next prime is 42442993. The reversal of 42442978 is 87924424.

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

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 42442978.

It is an unprimeable 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, 246676 + ... + 246847.

It is an arithmetic number, because the mean of its divisors is an integer number (8143146).

Almost surely, 2^42442978 is an apocalyptic number.

42442978 is a deficient number, since it is larger than the sum of its proper divisors (22702190).

42442978 is a wasteful number, since it uses less digits than its factorization.

42442978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493568.

The product of its digits is 129024, while the sum is 40.

The square root of 42442978 is about 6514.8275495212. The cubic root of 42442978 is about 348.8204592076.

The spelling of 42442978 in words is "forty-two million, four hundred forty-two thousand, nine hundred seventy-eight".