7821227 has 4 divisors (see below), whose sum is σ = 8003160. Its totient is φ = 7639296.

The previous prime is 7821221. The next prime is 7821239. The reversal of 7821227 is 7221287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7221287 = 23 ⋅313969.

It is a cyclic number.

It is not a de Polignac number, because 7821227 - 2⁴ = 7821211 is a prime.

It is a super-2 number, since 2×7821227² = 122343183571058, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7821227.

It is not an unprimeable number, because it can be changed into a prime (7821221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90902 + ... + 90987.

It is an arithmetic number, because the mean of its divisors is an integer number (2000790).

Almost surely, 2^7821227 is an apocalyptic number.

7821227 is a deficient number, since it is larger than the sum of its proper divisors (181933).

7821227 is a wasteful number, since it uses less digits than its factorization.

7821227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181932.

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

The square root of 7821227 is about 2796.6456693689. The cubic root of 7821227 is about 198.4989879968.

The spelling of 7821227 in words is "seven million, eight hundred twenty-one thousand, two hundred twenty-seven".