8740221 has 8 divisors (see below), whose sum is σ = 13318464. Its totient is φ = 4994400.

The previous prime is 8740219. The next prime is 8740273. The reversal of 8740221 is 1220478.

8740221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 8740221 - 2¹ = 8740219 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 8740191 and 8740200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8740321) 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, 208080 + ... + 208121.

It is an arithmetic number, because the mean of its divisors is an integer number (1664808).

Almost surely, 2^8740221 is an apocalyptic number.

It is an amenable number.

8740221 is a deficient number, since it is larger than the sum of its proper divisors (4578243).

8740221 is a wasteful number, since it uses less digits than its factorization.

8740221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416211.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 8740221 is about 2956.3864767652. The cubic root of 8740221 is about 205.9874705673.

Adding to 8740221 its reverse (1220478), we get a palindrome (9960699).

The spelling of 8740221 in words is "eight million, seven hundred forty thousand, two hundred twenty-one".