2217790 has 16 divisors (see below), whose sum is σ = 4013712. Its totient is φ = 882304.

The previous prime is 2217779. The next prime is 2217799. The reversal of 2217790 is 977122.

2217790 = 664² + 665² + ... + 668².

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2217799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1782 + ... + 2758.

It is an arithmetic number, because the mean of its divisors is an integer number (250857).

2^2217790 is an apocalyptic number.

2217790 is a deficient number, since it is larger than the sum of its proper divisors (1795922).

2217790 is a wasteful number, since it uses less digits than its factorization.

2217790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 2217790 is about 1489.2246304705. The cubic root of 2217790 is about 130.4087724787.

The spelling of 2217790 in words is "two million, two hundred seventeen thousand, seven hundred ninety".