3987857 has 4 divisors (see below), whose sum is σ = 4044096. Its totient is φ = 3931620.

The previous prime is 3987847. The next prime is 3987859. The reversal of 3987857 is 7587893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7587893 = 1153 ⋅6581.

It is a cyclic number.

It is not a de Polignac number, because 3987857 - 2¹⁸ = 3725713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3987859) 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, 28013 + ... + 28154.

It is an arithmetic number, because the mean of its divisors is an integer number (1011024).

Almost surely, 2^3987857 is an apocalyptic number.

It is an amenable number.

3987857 is a deficient number, since it is larger than the sum of its proper divisors (56239).

3987857 is an equidigital number, since it uses as much as digits as its factorization.

3987857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56238.

The product of its digits is 423360, while the sum is 47.

The square root of 3987857 is about 1996.9619425517. The cubic root of 3987857 is about 158.5793106181.

The spelling of 3987857 in words is "three million, nine hundred eighty-seven thousand, eight hundred fifty-seven".