1338221 has 4 divisors (see below), whose sum is σ = 1345212. Its totient is φ = 1331232.

The previous prime is 1338217. The next prime is 1338229. The reversal of 1338221 is 1228331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 792100 + 546121 = 890^2 + 739^2 .

It is a cyclic number.

It is not a de Polignac number, because 1338221 - 2² = 1338217 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1338193 and 1338202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1338229) 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, 3200 + ... + 3593.

It is an arithmetic number, because the mean of its divisors is an integer number (336303).

2^1338221 is an apocalyptic number.

It is an amenable number.

1338221 is a deficient number, since it is larger than the sum of its proper divisors (6991).

1338221 is an equidigital number, since it uses as much as digits as its factorization.

1338221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6990.

The product of its digits is 288, while the sum is 20.

The square root of 1338221 is about 1156.8150241071. The cubic root of 1338221 is about 110.1985669602.

The spelling of 1338221 in words is "one million, three hundred thirty-eight thousand, two hundred twenty-one".