3825781 has 2 divisors, whose sum is σ = 3825782. Its totient is φ = 3825780.

The previous prime is 3825743. The next prime is 3825793. The reversal of 3825781 is 1875283.

3825781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3006756 + 819025 = 1734^2 + 905^2 .

It is a cyclic number.

It is not a de Polignac number, because 3825781 - 2¹¹ = 3823733 is a prime.

It is a super-2 number, since 2×3825781² = 29273200519922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3825721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1912890 + 1912891.

It is an arithmetic number, because the mean of its divisors is an integer number (1912891).

Almost surely, 2^3825781 is an apocalyptic number.

It is an amenable number.

3825781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3825781 is an equidigital number, since it uses as much as digits as its factorization.

3825781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 34.

The square root of 3825781 is about 1955.9603779218. The cubic root of 3825781 is about 156.4011835914.

The spelling of 3825781 in words is "three million, eight hundred twenty-five thousand, seven hundred eighty-one".