2393821 has 4 divisors (see below), whose sum is σ = 2534652. Its totient is φ = 2252992.

The previous prime is 2393819. The next prime is 2393837. The reversal of 2393821 is 1283932.

2393821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1413721 + 980100 = 1189^2 + 990^2 .

It is a cyclic number.

It is not a de Polignac number, because 2393821 - 2¹ = 2393819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2393821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2393021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70390 + ... + 70423.

It is an arithmetic number, because the mean of its divisors is an integer number (633663).

2^2393821 is an apocalyptic number.

It is an amenable number.

2393821 is a deficient number, since it is larger than the sum of its proper divisors (140831).

2393821 is a wasteful number, since it uses less digits than its factorization.

2393821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140830.

The product of its digits is 2592, while the sum is 28.

The square root of 2393821 is about 1547.1977895537. The cubic root of 2393821 is about 133.7715905402.

The spelling of 2393821 in words is "two million, three hundred ninety-three thousand, eight hundred twenty-one".