42625721 has 8 divisors (see below), whose sum is σ = 44959200. Its totient is φ = 40301280.

The previous prime is 42625703. The next prime is 42625741. The reversal of 42625721 is 12752624.

It is a happy number.

42625721 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 42625721 - 2¹⁴ = 42609337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42625741) 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, 8885 + ... + 12813.

It is an arithmetic number, because the mean of its divisors is an integer number (5619900).

Almost surely, 2^42625721 is an apocalyptic number.

It is an amenable number.

42625721 is a deficient number, since it is larger than the sum of its proper divisors (2333479).

42625721 is a wasteful number, since it uses less digits than its factorization.

42625721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4519.

The product of its digits is 6720, while the sum is 29.

The square root of 42625721 is about 6528.8376454006. The cubic root of 42625721 is about 349.3203709483.

The spelling of 42625721 in words is "forty-two million, six hundred twenty-five thousand, seven hundred twenty-one".