2823021 has 6 divisors (see below), whose sum is σ = 4077710. Its totient is φ = 1882008.

The previous prime is 2822987. The next prime is 2823047. The reversal of 2823021 is 1203282.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2205225 + 617796 = 1485^2 + 786^2 .

It is not a de Polignac number, because 2823021 - 2⁷ = 2822893 is a prime.

It is a Duffinian number.

2823021 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2822985 and 2823003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2823221) 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, 156826 + ... + 156843.

2^2823021 is an apocalyptic number.

It is an amenable number.

2823021 is a deficient number, since it is larger than the sum of its proper divisors (1254689).

2823021 is a wasteful number, since it uses less digits than its factorization.

2823021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313675 (or 313672 counting only the distinct ones).

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

The square root of 2823021 is about 1680.1848112633. The cubic root of 2823021 is about 141.3311966915.

The spelling of 2823021 in words is "two million, eight hundred twenty-three thousand, twenty-one".