3870857 has 4 divisors (see below), whose sum is σ = 3874836. Its totient is φ = 3866880.

The previous prime is 3870847. The next prime is 3870863. The reversal of 3870857 is 7580783.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7580783 = 7 ⋅1082969.

It can be written as a sum of positive squares in 2 ways, for example, as 3171961 + 698896 = 1781^2 + 836^2 .

It is a cyclic number.

It is not a de Polignac number, because 3870857 - 2⁶ = 3870793 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3870857.

It is not an unprimeable number, because it can be changed into a prime (3870827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 557 + ... + 2837.

It is an arithmetic number, because the mean of its divisors is an integer number (968709).

Almost surely, 2^3870857 is an apocalyptic number.

It is an amenable number.

3870857 is a deficient number, since it is larger than the sum of its proper divisors (3979).

3870857 is a wasteful number, since it uses less digits than its factorization.

3870857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3978.

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 3870857 is about 1967.4493640244. The cubic root of 3870857 is about 157.0130352816.

The spelling of 3870857 in words is "three million, eight hundred seventy thousand, eight hundred fifty-seven".