42548721 has 4 divisors (see below), whose sum is σ = 56731632. Its totient is φ = 28365812.

The previous prime is 42548719. The next prime is 42548731. The reversal of 42548721 is 12784524.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42548721 - 2¹ = 42548719 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42548711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7091451 + ... + 7091456.

It is an arithmetic number, because the mean of its divisors is an integer number (14182908).

Almost surely, 2^42548721 is an apocalyptic number.

It is an amenable number.

42548721 is a deficient number, since it is larger than the sum of its proper divisors (14182911).

42548721 is a wasteful number, since it uses less digits than its factorization.

42548721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14182910.

The product of its digits is 17920, while the sum is 33.

The square root of 42548721 is about 6522.9380650133. The cubic root of 42548721 is about 349.1099042756.

The spelling of 42548721 in words is "forty-two million, five hundred forty-eight thousand, seven hundred twenty-one".