2302821 has 6 divisors (see below), whose sum is σ = 3326310. Its totient is φ = 1535208.

The previous prime is 2302799. The next prime is 2302841. The reversal of 2302821 is 1282032.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1988100 + 314721 = 1410^2 + 561^2 .

It is not a de Polignac number, because 2302821 - 2⁶ = 2302757 is a prime.

2302821 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2302794 and 2302803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2302841) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 127926 + ... + 127943.

It is an arithmetic number, because the mean of its divisors is an integer number (554385).

2^2302821 is an apocalyptic number.

It is an amenable number.

2302821 is a deficient number, since it is larger than the sum of its proper divisors (1023489).

2302821 is a wasteful number, since it uses less digits than its factorization.

2302821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255875 (or 255872 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 2302821 is about 1517.5048599593. The cubic root of 2302821 is about 132.0545573374.

Adding to 2302821 its reverse (1282032), we get a palindrome (3584853).

The spelling of 2302821 in words is "two million, three hundred two thousand, eight hundred twenty-one".