8749221 has 16 divisors (see below), whose sum is σ = 12625536. Its totient is φ = 5357376.

The previous prime is 8749219. The next prime is 8749229. The reversal of 8749221 is 1229478.

It is a happy number.

It is not a de Polignac number, because 8749221 - 2¹ = 8749219 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8749229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9831 + ... + 10683.

It is an arithmetic number, because the mean of its divisors is an integer number (789096).

Almost surely, 2^8749221 is an apocalyptic number.

It is an amenable number.

8749221 is a deficient number, since it is larger than the sum of its proper divisors (3876315).

8749221 is a wasteful number, since it uses less digits than its factorization.

8749221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132.

The product of its digits is 8064, while the sum is 33.

The square root of 8749221 is about 2957.9082135861. The cubic root of 8749221 is about 206.0581496066.

The spelling of 8749221 in words is "eight million, seven hundred forty-nine thousand, two hundred twenty-one".