7921115 has 16 divisors (see below), whose sum is σ = 9844416. Its totient is φ = 6115200.

The previous prime is 7921087. The next prime is 7921129. The reversal of 7921115 is 5111297.

It is not a de Polignac number, because 7921115 - 2¹⁰ = 7920091 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18605 + ... + 19025.

It is an arithmetic number, because the mean of its divisors is an integer number (615276).

Almost surely, 2^7921115 is an apocalyptic number.

7921115 is a deficient number, since it is larger than the sum of its proper divisors (1923301).

7921115 is a wasteful number, since it uses less digits than its factorization.

7921115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550.

The product of its digits is 630, while the sum is 26.

The square root of 7921115 is about 2814.4475479213. The cubic root of 7921115 is about 199.3404523755.

The spelling of 7921115 in words is "seven million, nine hundred twenty-one thousand, one hundred fifteen".