42248979 has 8 divisors (see below), whose sum is σ = 62591120. Its totient is φ = 28165968.

The previous prime is 42248971. The next prime is 42248981. The reversal of 42248979 is 97984224.

It is not a de Polignac number, because 42248979 - 2³ = 42248971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42248971) 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 7 ways as a sum of consecutive naturals, for example, 782362 + ... + 782415.

It is an arithmetic number, because the mean of its divisors is an integer number (7823890).

Almost surely, 2^42248979 is an apocalyptic number.

42248979 is a deficient number, since it is larger than the sum of its proper divisors (20342141).

42248979 is a wasteful number, since it uses less digits than its factorization.

42248979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1564786 (or 1564780 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 42248979 is about 6499.9214610640. The cubic root of 42248979 is about 348.2881828086.

It can be divided in two parts, 4224 and 8979, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 42248979 in words is "forty-two million, two hundred forty-eight thousand, nine hundred seventy-nine".