3986891 has 8 divisors (see below), whose sum is σ = 4367520. Its totient is φ = 3622528.

The previous prime is 3986839. The next prime is 3986897. The reversal of 3986891 is 1986893.

3986891 = 145² + 146² + ... + 246².

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 3986891 - 2¹⁰ = 3985867 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3986897) 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, 3551 + ... + 4536.

It is an arithmetic number, because the mean of its divisors is an integer number (545940).

Almost surely, 2^3986891 is an apocalyptic number.

3986891 is a deficient number, since it is larger than the sum of its proper divisors (380629).

3986891 is a wasteful number, since it uses less digits than its factorization.

3986891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8133.

The product of its digits is 93312, while the sum is 44.

The square root of 3986891 is about 1996.7200604992. The cubic root of 3986891 is about 158.5665050782.

The spelling of 3986891 in words is "three million, nine hundred eighty-six thousand, eight hundred ninety-one".