2738221 has 4 divisors (see below), whose sum is σ = 2746332. Its totient is φ = 2730112.

The previous prime is 2738201. The next prime is 2738227. The reversal of 2738221 is 1228372.

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 1716100 + 1022121 = 1310^2 + 1011^2 .

It is a cyclic number.

It is not a de Polignac number, because 2738221 - 2¹⁹ = 2213933 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 (2738227) 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, 3526 + ... + 4231.

It is an arithmetic number, because the mean of its divisors is an integer number (686583).

2^2738221 is an apocalyptic number.

It is an amenable number.

2738221 is a deficient number, since it is larger than the sum of its proper divisors (8111).

2738221 is an equidigital number, since it uses as much as digits as its factorization.

2738221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8110.

The product of its digits is 1344, while the sum is 25.

The square root of 2738221 is about 1654.7570818703. The cubic root of 2738221 is about 139.9016486104.

The spelling of 2738221 in words is "two million, seven hundred thirty-eight thousand, two hundred twenty-one".