42530721 has 8 divisors (see below), whose sum is σ = 59692320. Its totient is φ = 26861472.

The previous prime is 42530713. The next prime is 42530731. The reversal of 42530721 is 12703524.

42530721 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 not a de Polignac number, because 42530721 - 2³ = 42530713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42530691 and 42530700.

It is not an unprimeable number, because it can be changed into a prime (42530701) 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, 373020 + ... + 373133.

It is an arithmetic number, because the mean of its divisors is an integer number (7461540).

Almost surely, 2^42530721 is an apocalyptic number.

It is an amenable number.

42530721 is a deficient number, since it is larger than the sum of its proper divisors (17161599).

42530721 is a wasteful number, since it uses less digits than its factorization.

42530721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746175.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 42530721 is about 6521.5581727069. The cubic root of 42530721 is about 349.0606676634.

The spelling of 42530721 in words is "forty-two million, five hundred thirty thousand, seven hundred twenty-one".