42665979 has 8 divisors (see below), whose sum is σ = 57410320. Its totient is φ = 28182816.

The previous prime is 42665957. The next prime is 42666053. The reversal of 42665979 is 97956624.

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

It is not a de Polignac number, because 42665979 - 2⁵ = 42665947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42665179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64912 + ... + 65565.

It is an arithmetic number, because the mean of its divisors is an integer number (7176290).

Almost surely, 2^42665979 is an apocalyptic number.

42665979 is a deficient number, since it is larger than the sum of its proper divisors (14744341).

42665979 is a wasteful number, since it uses less digits than its factorization.

42665979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130589.

The product of its digits is 816480, while the sum is 48.

The square root of 42665979 is about 6531.9200086958. The cubic root of 42665979 is about 349.4303085964.

The spelling of 42665979 in words is "forty-two million, six hundred sixty-five thousand, nine hundred seventy-nine".