8919220 has 48 divisors (see below), whose sum is σ = 20396880. Its totient is φ = 3262464.

The previous prime is 8919217. The next prime is 8919223. The reversal of 8919220 is 229198.

It is an interprime number because it is at equal distance from previous prime (8919217) and next prime (8919223).

It can be written as a sum of positive squares in 8 ways, for example, as 86436 + 8832784 = 294^2 + 2972^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8919223) 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, 12226 + ... + 12934.

It is an arithmetic number, because the mean of its divisors is an integer number (424935).

Almost surely, 2^8919220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8919220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10198440).

8919220 is an abundant number, since it is smaller than the sum of its proper divisors (11477660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8919220 is a wasteful number, since it uses less digits than its factorization.

8919220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772 (or 770 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 8919220 is about 2986.5063201005. The cubic root of 8919220 is about 207.3841807812.

The spelling of 8919220 in words is "eight million, nine hundred nineteen thousand, two hundred twenty".