2239421 has 4 divisors (see below), whose sum is σ = 2270172. Its totient is φ = 2208672.

The previous prime is 2239417. The next prime is 2239453. The reversal of 2239421 is 1249322.

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 1473796 + 765625 = 1214^2 + 875^2 .

It is a cyclic number.

It is not a de Polignac number, because 2239421 - 2² = 2239417 is a prime.

It is a d-powerful number, because it can be written as 2⁹ + 2¹⁷ + 3³ + 9⁴ + 4⁶ + 2²¹ + 1 .

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2232421) 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, 15266 + ... + 15411.

It is an arithmetic number, because the mean of its divisors is an integer number (567543).

2^2239421 is an apocalyptic number.

It is an amenable number.

2239421 is a deficient number, since it is larger than the sum of its proper divisors (30751).

2239421 is an equidigital number, since it uses as much as digits as its factorization.

2239421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30750.

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

The square root of 2239421 is about 1496.4695118846. The cubic root of 2239421 is about 130.8313779397.

Subtracting from 2239421 its reverse (1249322), we obtain a palindrome (990099).

The spelling of 2239421 in words is "two million, two hundred thirty-nine thousand, four hundred twenty-one".