42665724 has 48 divisors (see below), whose sum is σ = 111283200. Its totient is φ = 14136048.

The previous prime is 42665723. The next prime is 42665743. The reversal of 42665724 is 42756624.

42665724 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42665723) 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 15 ways as a sum of consecutive naturals, for example, 18229 + ... + 20435.

It is an arithmetic number, because the mean of its divisors is an integer number (2318400).

Almost surely, 2^42665724 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42665724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55641600).

42665724 is an abundant number, since it is smaller than the sum of its proper divisors (68617476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42665724 is a wasteful number, since it uses less digits than its factorization.

42665724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2399 (or 2391 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 42665724 is about 6531.9004891379. The cubic root of 42665724 is about 349.4296124531.

The spelling of 42665724 in words is "forty-two million, six hundred sixty-five thousand, seven hundred twenty-four".