7438221 has 24 divisors (see below), whose sum is σ = 12614784. Its totient is φ = 4134240.

The previous prime is 7438219. The next prime is 7438241. The reversal of 7438221 is 1228347.

7438221 is a `hidden beast` number, since 7 + 438 + 221 = 666.

It is not a de Polignac number, because 7438221 - 2¹ = 7438219 is a prime.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7438241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 736 + ... + 3926.

It is an arithmetic number, because the mean of its divisors is an integer number (525616).

Almost surely, 2^7438221 is an apocalyptic number.

It is an amenable number.

7438221 is a deficient number, since it is larger than the sum of its proper divisors (5176563).

7438221 is a wasteful number, since it uses less digits than its factorization.

7438221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3241 (or 3238 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 7438221 is about 2727.3102133787. The cubic root of 7438221 is about 195.2044404196.

The spelling of 7438221 in words is "seven million, four hundred thirty-eight thousand, two hundred twenty-one".