42872521 has 8 divisors (see below), whose sum is σ = 45471240. Its totient is φ = 40282368.

The previous prime is 42872513. The next prime is 42872567. The reversal of 42872521 is 12527824.

It is a happy number.

42872521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 622521 + 42250000 = 789^2 + 6500^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42872521 - 2³ = 42872513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42872021) 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, 10275 + ... + 13831.

It is an arithmetic number, because the mean of its divisors is an integer number (5683905).

Almost surely, 2^42872521 is an apocalyptic number.

It is an amenable number.

42872521 is a deficient number, since it is larger than the sum of its proper divisors (2598719).

42872521 is a wasteful number, since it uses less digits than its factorization.

42872521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4283.

The product of its digits is 8960, while the sum is 31.

The square root of 42872521 is about 6547.7111267984. The cubic root of 42872521 is about 349.9932542918.

The spelling of 42872521 in words is "forty-two million, eight hundred seventy-two thousand, five hundred twenty-one".