7215865 has 8 divisors (see below), whose sum is σ = 8686080. Its totient is φ = 5754672.

The previous prime is 7215829. The next prime is 7215869. The reversal of 7215865 is 5685127.

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

It is a cyclic number.

It is not a de Polignac number, because 7215865 - 2¹⁹ = 6691577 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7215865.

It is not an unprimeable number, because it can be changed into a prime (7215869) 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, 345 + ... + 3814.

It is an arithmetic number, because the mean of its divisors is an integer number (1085760).

Almost surely, 2^7215865 is an apocalyptic number.

It is an amenable number.

7215865 is a deficient number, since it is larger than the sum of its proper divisors (1470215).

7215865 is a wasteful number, since it uses less digits than its factorization.

7215865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4511.

The product of its digits is 16800, while the sum is 34.

The square root of 7215865 is about 2686.2362144830. The cubic root of 7215865 is about 193.2396014793.

The spelling of 7215865 in words is "seven million, two hundred fifteen thousand, eight hundred sixty-five".