3287821 has 2 divisors, whose sum is σ = 3287822. Its totient is φ = 3287820.

The previous prime is 3287819. The next prime is 3287833. The reversal of 3287821 is 1287823.

3287821 = T₁₄₇₉ + T₁₄₈₀ + T₁₄₈₁.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3279721 + 8100 = 1811^2 + 90^2 .

It is a cyclic number.

It is not a de Polignac number, because 3287821 - 2¹ = 3287819 is a prime.

It is a super-3 number, since 3×3287821³ (a number of 21 digits) contains 333 as substring.

Together with 3287819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3287861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1643910 + 1643911.

It is an arithmetic number, because the mean of its divisors is an integer number (1643911).

Almost surely, 2^3287821 is an apocalyptic number.

3287821 is the 1481-st centered triangular number.

It is an amenable number.

3287821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3287821 is an equidigital number, since it uses as much as digits as its factorization.

3287821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 31.

The square root of 3287821 is about 1813.2349544392. The cubic root of 3287821 is about 148.6971763570.

The spelling of 3287821 in words is "three million, two hundred eighty-seven thousand, eight hundred twenty-one".