47639221 has 6 divisors (see below), whose sum is σ = 55417110. Its totient is φ = 40833576.

The previous prime is 47639177. The next prime is 47639237. The reversal of 47639221 is 12293674.

It can be written as a sum of positive squares in only one way, i.e., 46104100 + 1535121 = 6790^2 + 1239^2 .

It is a de Polignac number, because none of the positive numbers 2^k-47639221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47639021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 486066 + ... + 486163.

It is an arithmetic number, because the mean of its divisors is an integer number (9236185).

Almost surely, 2^47639221 is an apocalyptic number.

It is an amenable number.

47639221 is a deficient number, since it is larger than the sum of its proper divisors (7777889).

47639221 is an equidigital number, since it uses as much as digits as its factorization.

47639221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972243 (or 972236 counting only the distinct ones).

The product of its digits is 18144, while the sum is 34.

The square root of 47639221 is about 6902.1171389654. The cubic root of 47639221 is about 362.5113014312.

The spelling of 47639221 in words is "forty-seven million, six hundred thirty-nine thousand, two hundred twenty-one".