2216997 has 16 divisors (see below), whose sum is σ = 3311680. Its totient is φ = 1465776.

The previous prime is 2216989. The next prime is 2216999. The reversal of 2216997 is 7996122.

It is not a de Polignac number, because 2216997 - 2³ = 2216989 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 (2216999) 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, 3978 + ... + 4500.

It is an arithmetic number, because the mean of its divisors is an integer number (206980).

2^2216997 is an apocalyptic number.

2216997 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

2216997 is the 942-nd heptagonal number.

It is an amenable number.

2216997 is a deficient number, since it is larger than the sum of its proper divisors (1094683).

2216997 is a wasteful number, since it uses less digits than its factorization.

2216997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689 (or 683 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 2216997 is about 1488.9583607341. The cubic root of 2216997 is about 130.3932275015.

The spelling of 2216997 in words is "two million, two hundred sixteen thousand, nine hundred ninety-seven".