3987871 has 8 divisors (see below), whose sum is σ = 4143744. Its totient is φ = 3833760.

The previous prime is 3987859. The next prime is 3987887. The reversal of 3987871 is 1787893.

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

It is a cyclic number.

It is not a de Polignac number, because 3987871 - 2⁵ = 3987839 is a prime.

It is a super-2 number, since 2×3987871² = 31806230225282, 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 (3987811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5781 + ... + 6433.

It is an arithmetic number, because the mean of its divisors is an integer number (517968).

Almost surely, 2^3987871 is an apocalyptic number.

3987871 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

3987871 is a deficient number, since it is larger than the sum of its proper divisors (155873).

3987871 is a wasteful number, since it uses less digits than its factorization.

3987871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881.

The product of its digits is 84672, while the sum is 43.

The square root of 3987871 is about 1996.9654478733. The cubic root of 3987871 is about 158.5794961904.

The spelling of 3987871 in words is "three million, nine hundred eighty-seven thousand, eight hundred seventy-one".