3986981 has 4 divisors (see below), whose sum is σ = 4160352. Its totient is φ = 3813612.

The previous prime is 3986977. The next prime is 3986987. The reversal of 3986981 is 1896893.

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.

It is a cyclic number.

It is not a de Polignac number, because 3986981 - 2² = 3986977 is a prime.

It is a super-2 number, since 2×3986981² = 31792034988722, 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 (3986987) 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, 86651 + ... + 86696.

It is an arithmetic number, because the mean of its divisors is an integer number (1040088).

Almost surely, 2^3986981 is an apocalyptic number.

It is an amenable number.

3986981 is a deficient number, since it is larger than the sum of its proper divisors (173371).

3986981 is a wasteful number, since it uses less digits than its factorization.

3986981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173370.

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

The square root of 3986981 is about 1996.7425973320. The cubic root of 3986981 is about 158.5676982283.

The spelling of 3986981 in words is "three million, nine hundred eighty-six thousand, nine hundred eighty-one".