2238821 has 4 divisors (see below), whose sum is σ = 2411052. Its totient is φ = 2066592.

The previous prime is 2238811. The next prime is 2238823. The reversal of 2238821 is 1288322.

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 168100 + 2070721 = 410^2 + 1439^2 .

It is a cyclic number.

It is not a de Polignac number, because 2238821 - 2⁶ = 2238757 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 (2238823) 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, 86096 + ... + 86121.

It is an arithmetic number, because the mean of its divisors is an integer number (602763).

2^2238821 is an apocalyptic number.

It is an amenable number.

2238821 is a deficient number, since it is larger than the sum of its proper divisors (172231).

2238821 is a wasteful number, since it uses less digits than its factorization.

2238821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172230.

The product of its digits is 1536, while the sum is 26.

The square root of 2238821 is about 1496.2690266125. The cubic root of 2238821 is about 130.8196925028.

The spelling of 2238821 in words is "two million, two hundred thirty-eight thousand, eight hundred twenty-one".