47805721 has 8 divisors (see below), whose sum is σ = 49213440. Its totient is φ = 46414368.

The previous prime is 47805701. The next prime is 47805757. The reversal of 47805721 is 12750874.

It is a happy number.

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 47805721 - 2¹¹ = 47803673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47805701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1965 + ... + 9973.

It is an arithmetic number, because the mean of its divisors is an integer number (6151680).

Almost surely, 2^47805721 is an apocalyptic number.

It is an amenable number.

47805721 is a deficient number, since it is larger than the sum of its proper divisors (1407719).

47805721 is a wasteful number, since it uses less digits than its factorization.

47805721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8183.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 47805721 is about 6914.1681350687. The cubic root of 47805721 is about 362.9331383759.

It can be divided in two parts, 4780 and 5721, that added together give a palindrome (10501).

The spelling of 47805721 in words is "forty-seven million, eight hundred five thousand, seven hundred twenty-one".