2823421 has 4 divisors (see below), whose sum is σ = 2862172. Its totient is φ = 2784672.

The previous prime is 2823407. The next prime is 2823437. The reversal of 2823421 is 1243282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1243282 = 2 ⋅621641.

It can be written as a sum of positive squares in 2 ways, for example, as 688900 + 2134521 = 830^2 + 1461^2 .

It is a cyclic number.

It is not a de Polignac number, because 2823421 - 2⁵ = 2823389 is a prime.

It is a super-2 number, since 2×2823421² = 15943412286482, which contains 22 as substring.

It is a Duffinian number.

2823421 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2823392 and 2823401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2823451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19266 + ... + 19411.

It is an arithmetic number, because the mean of its divisors is an integer number (715543).

2^2823421 is an apocalyptic number.

It is an amenable number.

2823421 is a deficient number, since it is larger than the sum of its proper divisors (38751).

2823421 is an equidigital number, since it uses as much as digits as its factorization.

2823421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38750.

The product of its digits is 768, while the sum is 22.

The square root of 2823421 is about 1680.3038415715. The cubic root of 2823421 is about 141.3378715514.

The spelling of 2823421 in words is "two million, eight hundred twenty-three thousand, four hundred twenty-one".