3871145 has 4 divisors (see below), whose sum is σ = 4645380. Its totient is φ = 3096912.

The previous prime is 3871139. The next prime is 3871151. The reversal of 3871145 is 5411783.

3871145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5411783 = 13 ⋅416291.

It is an interprime number because it is at equal distance from previous prime (3871139) and next prime (3871151).

It can be written as a sum of positive squares in 2 ways, for example, as 2676496 + 1194649 = 1636^2 + 1093^2 .

It is a cyclic number.

It is not a de Polignac number, because 3871145 - 2⁴ = 3871129 is a prime.

It is a super-2 number, since 2×3871145² = 29971527222050, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 387110 + ... + 387119.

It is an arithmetic number, because the mean of its divisors is an integer number (1161345).

Almost surely, 2^3871145 is an apocalyptic number.

It is an amenable number.

3871145 is a deficient number, since it is larger than the sum of its proper divisors (774235).

3871145 is an equidigital number, since it uses as much as digits as its factorization.

3871145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774234.

The product of its digits is 3360, while the sum is 29.

The square root of 3871145 is about 1967.5225538733. The cubic root of 3871145 is about 157.0169292197.

The spelling of 3871145 in words is "three million, eight hundred seventy-one thousand, one hundred forty-five".