3856745 has 4 divisors (see below), whose sum is σ = 4628100. Its totient is φ = 3085392.

The previous prime is 3856733. The next prime is 3856751. The reversal of 3856745 is 5476583.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1087849 + 2768896 = 1043^2 + 1664^2 .

It is a cyclic number.

It is not a de Polignac number, because 3856745 - 2⁴ = 3856729 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3856699 and 3856708.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385670 + ... + 385679.

It is an arithmetic number, because the mean of its divisors is an integer number (1157025).

Almost surely, 2^3856745 is an apocalyptic number.

It is an amenable number.

3856745 is a deficient number, since it is larger than the sum of its proper divisors (771355).

3856745 is an equidigital number, since it uses as much as digits as its factorization.

3856745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771354.

The product of its digits is 100800, while the sum is 38.

The square root of 3856745 is about 1963.8597200411. The cubic root of 3856745 is about 156.8219952355.

The spelling of 3856745 in words is "three million, eight hundred fifty-six thousand, seven hundred forty-five".