47740221 has 12 divisors (see below), whose sum is σ = 69018300. Its totient is φ = 31799040.

The previous prime is 47740213. The next prime is 47740243. The reversal of 47740221 is 12204774.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 32832900 + 14907321 = 5730^2 + 3861^2 .

It is not a de Polignac number, because 47740221 - 2³ = 47740213 is a prime.

It is a super-2 number, since 2×47740221² = 4558257402257682, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47740261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17455 + ... + 20003.

It is an arithmetic number, because the mean of its divisors is an integer number (5751525).

Almost surely, 2^47740221 is an apocalyptic number.

It is an amenable number.

47740221 is a deficient number, since it is larger than the sum of its proper divisors (21278079).

47740221 is a wasteful number, since it uses less digits than its factorization.

47740221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4636 (or 4633 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 27.

The square root of 47740221 is about 6909.4298607049. The cubic root of 47740221 is about 362.7673075555.

Adding to 47740221 its reverse (12204774), we get a palindrome (59944995).

It can be divided in two parts, 47740 and 221, that added together give a square (47961 = 219²).

The spelling of 47740221 in words is "forty-seven million, seven hundred forty thousand, two hundred twenty-one".