2217740 has 72 divisors (see below), whose sum is σ = 5668992. Its totient is φ = 725760.

The previous prime is 2217673. The next prime is 2217749. The reversal of 2217740 is 477122.

It is not an unprimeable number, because it can be changed into a prime (2217749) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30344 + ... + 30416.

It is an arithmetic number, because the mean of its divisors is an integer number (78736).

2^2217740 is an apocalyptic number.

2217740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2217740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2834496).

2217740 is an abundant number, since it is smaller than the sum of its proper divisors (3451252).

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

2217740 is a wasteful number, since it uses less digits than its factorization.

2217740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 2217740 is about 1489.2078431166. The cubic root of 2217740 is about 130.4077924509.

The spelling of 2217740 in words is "two million, two hundred seventeen thousand, seven hundred forty".