2439221 has 2 divisors, whose sum is σ = 2439222. Its totient is φ = 2439220.

The previous prime is 2439197. The next prime is 2439247. The reversal of 2439221 is 1229342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2436721 + 2500 = 1561^2 + 50^2 .

It is a cyclic number.

It is not a de Polignac number, because 2439221 - 2¹⁴ = 2422837 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2435221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1219610 + 1219611.

It is an arithmetic number, because the mean of its divisors is an integer number (1219611).

2^2439221 is an apocalyptic number.

It is an amenable number.

2439221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2439221 is an equidigital number, since it uses as much as digits as its factorization.

2439221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

The square root of 2439221 is about 1561.8005634523. The cubic root of 2439221 is about 134.6119813854.

The spelling of 2439221 in words is "two million, four hundred thirty-nine thousand, two hundred twenty-one".