7889221 has 4 divisors (see below), whose sum is σ = 8143744. Its totient is φ = 7634700.

The previous prime is 7889149. The next prime is 7889239. The reversal of 7889221 is 1229887.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1229887 = 941 ⋅1307.

It is a cyclic number.

It is not a de Polignac number, because 7889221 - 2²¹ = 5792069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7889281) 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, 127215 + ... + 127276.

It is an arithmetic number, because the mean of its divisors is an integer number (2035936).

Almost surely, 2^7889221 is an apocalyptic number.

It is an amenable number.

7889221 is a deficient number, since it is larger than the sum of its proper divisors (254523).

7889221 is a wasteful number, since it uses less digits than its factorization.

7889221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254522.

The product of its digits is 16128, while the sum is 37.

The square root of 7889221 is about 2808.7757119428. The cubic root of 7889221 is about 199.0725474738.

The spelling of 7889221 in words is "seven million, eight hundred eighty-nine thousand, two hundred twenty-one".