7439221 has 8 divisors (see below), whose sum is σ = 7570304. Its totient is φ = 7309440.

The previous prime is 7439219. The next prime is 7439231. The reversal of 7439221 is 1229347.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7439221 - 2¹ = 7439219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7439221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7439231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26146 + ... + 26428.

It is an arithmetic number, because the mean of its divisors is an integer number (946288).

Almost surely, 2^7439221 is an apocalyptic number.

It is an amenable number.

7439221 is a deficient number, since it is larger than the sum of its proper divisors (131083).

7439221 is a wasteful number, since it uses less digits than its factorization.

7439221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651.

The product of its digits is 3024, while the sum is 28.

The square root of 7439221 is about 2727.4935380308. The cubic root of 7439221 is about 195.2131878379.

The spelling of 7439221 in words is "seven million, four hundred thirty-nine thousand, two hundred twenty-one".