7220385 has 12 divisors (see below), whose sum is σ = 12515412. Its totient is φ = 3850848.

The previous prime is 7220383. The next prime is 7220407. The reversal of 7220385 is 5830227.

It can be written as a sum of positive squares in 2 ways, for example, as 1065024 + 6155361 = 1032^2 + 2481^2 .

It is not a de Polignac number, because 7220385 - 2¹ = 7220383 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7220383) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 80182 + ... + 80271.

It is an arithmetic number, because the mean of its divisors is an integer number (1042951).

Almost surely, 2^7220385 is an apocalyptic number.

It is an amenable number.

7220385 is a deficient number, since it is larger than the sum of its proper divisors (5295027).

7220385 is a wasteful number, since it uses less digits than its factorization.

7220385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160464 (or 160461 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 7220385 is about 2687.0774086356. The cubic root of 7220385 is about 193.2799413271.

The spelling of 7220385 in words is "seven million, two hundred twenty thousand, three hundred eighty-five".