2721823 has 4 divisors (see below), whose sum is σ = 2931208. Its totient is φ = 2512440.

The previous prime is 2721821. The next prime is 2721827. The reversal of 2721823 is 3281272.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2721823 - 2¹ = 2721821 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 (2721821) 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, 104673 + ... + 104698.

It is an arithmetic number, because the mean of its divisors is an integer number (732802).

2^2721823 is an apocalyptic number.

2721823 is a deficient number, since it is larger than the sum of its proper divisors (209385).

2721823 is a wasteful number, since it uses less digits than its factorization.

2721823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209384.

The product of its digits is 1344, while the sum is 25.

The square root of 2721823 is about 1649.7948357296. The cubic root of 2721823 is about 139.6218194809.

The spelling of 2721823 in words is "two million, seven hundred twenty-one thousand, eight hundred twenty-three".