2217989 has 4 divisors (see below), whose sum is σ = 2230560. Its totient is φ = 2205420.

The previous prime is 2217967. The next prime is 2217991. The reversal of 2217989 is 9897122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2217989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2216989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6017 + ... + 6374.

It is an arithmetic number, because the mean of its divisors is an integer number (557640).

2^2217989 is an apocalyptic number.

It is an amenable number.

2217989 is a deficient number, since it is larger than the sum of its proper divisors (12571).

2217989 is a wasteful number, since it uses less digits than its factorization.

2217989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12570.

The product of its digits is 18144, while the sum is 38.

The square root of 2217989 is about 1489.2914422637. The cubic root of 2217989 is about 130.4126728434.

The spelling of 2217989 in words is "two million, two hundred seventeen thousand, nine hundred eighty-nine".