42239979 has 12 divisors (see below), whose sum is σ = 63117600. Its totient is φ = 27188784.

The previous prime is 42239971. The next prime is 42240013. The reversal of 42239979 is 97993224.

42239979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42239979 - 2³ = 42239971 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (42239971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80659 + ... + 81180.

It is an arithmetic number, because the mean of its divisors is an integer number (5259800).

Almost surely, 2^42239979 is an apocalyptic number.

42239979 is a deficient number, since it is larger than the sum of its proper divisors (20877621).

42239979 is a wasteful number, since it uses less digits than its factorization.

42239979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161874 (or 161871 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 42239979 is about 6499.2291081327. The cubic root of 42239979 is about 348.2634499328.

It can be divided in two parts, 422 and 39979, that added together give a square (40401 = 201²).

The spelling of 42239979 in words is "forty-two million, two hundred thirty-nine thousand, nine hundred seventy-nine".