7217397 has 32 divisors (see below), whose sum is σ = 12288000. Its totient is φ = 4140720.

The previous prime is 7217369. The next prime is 7217407. The reversal of 7217397 is 7937127.

7217397 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7217397 - 2¹⁰ = 7216373 is a prime.

7217397 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 31 ways as a sum of consecutive naturals, for example, 5004 + ... + 6282.

It is an arithmetic number, because the mean of its divisors is an integer number (384000).

Almost surely, 2^7217397 is an apocalyptic number.

It is an amenable number.

7217397 is a deficient number, since it is larger than the sum of its proper divisors (5070603).

7217397 is a wasteful number, since it uses less digits than its factorization.

7217397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318 (or 1312 counting only the distinct ones).

The product of its digits is 18522, while the sum is 36.

The square root of 7217397 is about 2686.5213566990. The cubic root of 7217397 is about 193.2532760756.

It can be divided in two parts, 721 and 7397, that added together give a palindrome (8118).

The spelling of 7217397 in words is "seven million, two hundred seventeen thousand, three hundred ninety-seven".