2821823 has 4 divisors (see below), whose sum is σ = 2970360. Its totient is φ = 2673288.

The previous prime is 2821817. The next prime is 2821829. The reversal of 2821823 is 3281282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3281282 = 2 ⋅1640641.

It is an interprime number because it is at equal distance from previous prime (2821817) and next prime (2821829).

It is a cyclic number.

It is not a de Polignac number, because 2821823 - 2⁴ = 2821807 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2821792 and 2821801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2821829) 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, 74240 + ... + 74277.

It is an arithmetic number, because the mean of its divisors is an integer number (742590).

2^2821823 is an apocalyptic number.

2821823 is a deficient number, since it is larger than the sum of its proper divisors (148537).

2821823 is a wasteful number, since it uses less digits than its factorization.

2821823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148536.

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

The square root of 2821823 is about 1679.8282650319. The cubic root of 2821823 is about 141.3112017133.

The spelling of 2821823 in words is "two million, eight hundred twenty-one thousand, eight hundred twenty-three".