42652721 has 4 divisors (see below), whose sum is σ = 42716772. Its totient is φ = 42588672.

The previous prime is 42652703. The next prime is 42652723. The reversal of 42652721 is 12725624.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5880625 + 36772096 = 2425^2 + 6064^2 .

It is a cyclic number.

It is not a de Polignac number, because 42652721 - 2¹⁴ = 42636337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42652723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31016 + ... + 32361.

It is an arithmetic number, because the mean of its divisors is an integer number (10679193).

Almost surely, 2^42652721 is an apocalyptic number.

It is an amenable number.

42652721 is a deficient number, since it is larger than the sum of its proper divisors (64051).

42652721 is an equidigital number, since it uses as much as digits as its factorization.

42652721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64050.

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

The square root of 42652721 is about 6530.9050674466. The cubic root of 42652721 is about 349.3941109273.

The spelling of 42652721 in words is "forty-two million, six hundred fifty-two thousand, seven hundred twenty-one".