47824921 has 4 divisors (see below), whose sum is σ = 48727332. Its totient is φ = 46922512.

The previous prime is 47824913. The next prime is 47824937. The reversal of 47824921 is 12942874.

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 20115225 + 27709696 = 4485^2 + 5264^2 .

It is a cyclic number.

It is not a de Polignac number, because 47824921 - 2³ = 47824913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47824321) 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, 451126 + ... + 451231.

It is an arithmetic number, because the mean of its divisors is an integer number (12181833).

Almost surely, 2^47824921 is an apocalyptic number.

It is an amenable number.

47824921 is a deficient number, since it is larger than the sum of its proper divisors (902411).

47824921 is an equidigital number, since it uses as much as digits as its factorization.

47824921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902410.

The product of its digits is 32256, while the sum is 37.

The square root of 47824921 is about 6915.5564490502. The cubic root of 47824921 is about 362.9817196156.

The spelling of 47824921 in words is "forty-seven million, eight hundred twenty-four thousand, nine hundred twenty-one".