7217215 has 8 divisors (see below), whose sum is σ = 8803008. Its totient is φ = 5678880.

The previous prime is 7217213. The next prime is 7217219. The reversal of 7217215 is 5127127.

It is a happy number.

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

It is not a de Polignac number, because 7217215 - 2¹ = 7217213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7217215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7217213) 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, 11527 + ... + 12136.

It is an arithmetic number, because the mean of its divisors is an integer number (1100376).

Almost surely, 2^7217215 is an apocalyptic number.

7217215 is a deficient number, since it is larger than the sum of its proper divisors (1585793).

7217215 is a wasteful number, since it uses less digits than its factorization.

7217215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23729.

The product of its digits is 980, while the sum is 25.

The square root of 7217215 is about 2686.4874836857. The cubic root of 7217215 is about 193.2516516491.

The spelling of 7217215 in words is "seven million, two hundred seventeen thousand, two hundred fifteen".