7827221 has 16 divisors (see below), whose sum is σ = 8655360. Its totient is φ = 7050240.

The previous prime is 7827217. The next prime is 7827223. The reversal of 7827221 is 1227287.

It is a cyclic number.

It is not a de Polignac number, because 7827221 - 2² = 7827217 is a prime.

It is a super-2 number, since 2×7827221² = 122530777165682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7827223) 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, 57065 + ... + 57201.

It is an arithmetic number, because the mean of its divisors is an integer number (540960).

Almost surely, 2^7827221 is an apocalyptic number.

It is an amenable number.

7827221 is a deficient number, since it is larger than the sum of its proper divisors (828139).

7827221 is a wasteful number, since it uses less digits than its factorization.

7827221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284.

The product of its digits is 3136, while the sum is 29.

The square root of 7827221 is about 2797.7171050698. The cubic root of 7827221 is about 198.5496833296.

The spelling of 7827221 in words is "seven million, eight hundred twenty-seven thousand, two hundred twenty-one".