42572721 has 8 divisors (see below), whose sum is σ = 56795904. Its totient is φ = 28365680.

The previous prime is 42572687. The next prime is 42572729. The reversal of 42572721 is 12727524.

42572721 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 a de Polignac number, because none of the positive numbers 2^k-42572721 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42572729) 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, 5035 + ... + 10511.

It is an arithmetic number, because the mean of its divisors is an integer number (7099488).

Almost surely, 2^42572721 is an apocalyptic number.

It is an amenable number.

42572721 is a deficient number, since it is larger than the sum of its proper divisors (14223183).

42572721 is a wasteful number, since it uses less digits than its factorization.

42572721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8071.

The product of its digits is 7840, while the sum is 30.

The square root of 42572721 is about 6524.7774674697. Note that the first 3 decimals coincide. The cubic root of 42572721 is about 349.1755314958.

The spelling of 42572721 in words is "forty-two million, five hundred seventy-two thousand, seven hundred twenty-one".