3143821 has 4 divisors (see below), whose sum is σ = 3148732. Its totient is φ = 3138912.

The previous prime is 3143813. The next prime is 3143851. The reversal of 3143821 is 1283413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1283413 = 73 ⋅17581.

It can be written as a sum of positive squares in 2 ways, for example, as 741321 + 2402500 = 861^2 + 1550^2 .

It is a cyclic number.

It is not a de Polignac number, because 3143821 - 2³ = 3143813 is a prime.

It is a super-2 number, since 2×3143821² = 19767220960082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3143792 and 3143801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3143851) 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, 1320 + ... + 2833.

It is an arithmetic number, because the mean of its divisors is an integer number (787183).

Almost surely, 2^3143821 is an apocalyptic number.

It is an amenable number.

3143821 is a deficient number, since it is larger than the sum of its proper divisors (4911).

3143821 is an equidigital number, since it uses as much as digits as its factorization.

3143821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4910.

The product of its digits is 576, while the sum is 22.

The square root of 3143821 is about 1773.0823443935. The cubic root of 3143821 is about 146.4938086354.

The spelling of 3143821 in words is "three million, one hundred forty-three thousand, eight hundred twenty-one".