7221765 has 16 divisors (see below), whose sum is σ = 11719296. Its totient is φ = 3796800.

The previous prime is 7221757. The next prime is 7221769. The reversal of 7221765 is 5671227.

It is not a de Polignac number, because 7221765 - 2³ = 7221757 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7221769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2326 + ... + 4455.

It is an arithmetic number, because the mean of its divisors is an integer number (732456).

Almost surely, 2^7221765 is an apocalyptic number.

It is an amenable number.

7221765 is a deficient number, since it is larger than the sum of its proper divisors (4497531).

7221765 is a wasteful number, since it uses less digits than its factorization.

7221765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6860.

The product of its digits is 5880, while the sum is 30.

The square root of 7221765 is about 2687.3341809310. The cubic root of 7221765 is about 193.2922541206.

The spelling of 7221765 in words is "seven million, two hundred twenty-one thousand, seven hundred sixty-five".