7217997 has 8 divisors (see below), whose sum is σ = 9884256. Its totient is φ = 4681872.

The previous prime is 7217963. The next prime is 7218019. The reversal of 7217997 is 7997127.

7217997 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7217997 - 2¹⁰ = 7216973 is a prime.

7217997 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7217797) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32403 + ... + 32624.

It is an arithmetic number, because the mean of its divisors is an integer number (1235532).

Almost surely, 2^7217997 is an apocalyptic number.

It is an amenable number.

7217997 is a deficient number, since it is larger than the sum of its proper divisors (2666259).

7217997 is a wasteful number, since it uses less digits than its factorization.

7217997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65067.

The product of its digits is 55566, while the sum is 42.

The square root of 7217997 is about 2686.6330229490. The cubic root of 7217997 is about 193.2586311342.

The spelling of 7217997 in words is "seven million, two hundred seventeen thousand, nine hundred ninety-seven".