3905281 has 8 divisors (see below), whose sum is σ = 4028264. Its totient is φ = 3784320.

The previous prime is 3905273. The next prime is 3905299. The reversal of 3905281 is 1825093.

3905281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 370881 + 3534400 = 609^2 + 1880^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3905281 - 2³ = 3905273 is a prime.

It is a super-2 number, since 2×3905281² = 30502439377922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3905201) 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 in 7 ways as a sum of consecutive naturals, for example, 4015 + ... + 4891.

It is an arithmetic number, because the mean of its divisors is an integer number (503533).

Almost surely, 2^3905281 is an apocalyptic number.

It is an amenable number.

3905281 is a deficient number, since it is larger than the sum of its proper divisors (122983).

3905281 is an equidigital number, since it uses as much as digits as its factorization.

3905281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 3905281 is about 1976.1783826365. The cubic root of 3905281 is about 157.4771076159.

It can be divided in two parts, 3905 and 281, that added together give a triangular number (4186 = T₉₁).

The spelling of 3905281 in words is "three million, nine hundred five thousand, two hundred eighty-one".