2823921 has 12 divisors (see below), whose sum is σ = 4319172. Its totient is φ = 1771776.

The previous prime is 2823911. The next prime is 2823923. The reversal of 2823921 is 1293282.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2143296 + 680625 = 1464^2 + 825^2 .

It is not a de Polignac number, because 2823921 - 2⁵ = 2823889 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2823923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9076 + ... + 9381.

It is an arithmetic number, because the mean of its divisors is an integer number (359931).

2^2823921 is an apocalyptic number.

It is an amenable number.

2823921 is a deficient number, since it is larger than the sum of its proper divisors (1495251).

2823921 is a wasteful number, since it uses less digits than its factorization.

2823921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18480 (or 18477 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 2823921 is about 1680.4526176004. The cubic root of 2823921 is about 141.3462142398.

The spelling of 2823921 in words is "two million, eight hundred twenty-three thousand, nine hundred twenty-one".