42039979 has 8 divisors (see below), whose sum is σ = 42596928. Its totient is φ = 41486280.

The previous prime is 42039967. The next prime is 42040007. The reversal of 42039979 is 97993024.

42039979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 42039979 - 2⁵ = 42039947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42039779) 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 7 ways as a sum of consecutive naturals, for example, 34824 + ... + 36010.

It is an arithmetic number, because the mean of its divisors is an integer number (5324616).

Almost surely, 2^42039979 is an apocalyptic number.

42039979 is a deficient number, since it is larger than the sum of its proper divisors (556949).

42039979 is a wasteful number, since it uses less digits than its factorization.

42039979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1625.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 42039979 is about 6483.8244115645. The cubic root of 42039979 is about 347.7129216306.

The spelling of 42039979 in words is "forty-two million, thirty-nine thousand, nine hundred seventy-nine".