7215385 has 16 divisors (see below), whose sum is σ = 9030672. Its totient is φ = 5529600.

The previous prime is 7215347. The next prime is 7215401. The reversal of 7215385 is 5835127.

It can be written as a sum of positive squares in 8 ways, for example, as 646416 + 6568969 = 804^2 + 2563^2 .

It is not a de Polignac number, because 7215385 - 2⁹ = 7214873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12217 + ... + 12793.

It is an arithmetic number, because the mean of its divisors is an integer number (564417).

Almost surely, 2^7215385 is an apocalyptic number.

It is an amenable number.

7215385 is a deficient number, since it is larger than the sum of its proper divisors (1815287).

7215385 is a wasteful number, since it uses less digits than its factorization.

7215385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684.

The product of its digits is 8400, while the sum is 31.

The square root of 7215385 is about 2686.1468686578. The cubic root of 7215385 is about 193.2353166123.

The spelling of 7215385 in words is "seven million, two hundred fifteen thousand, three hundred eighty-five".