3986869 has 4 divisors (see below), whose sum is σ = 4071744. Its totient is φ = 3901996.

The previous prime is 3986839. The next prime is 3986897. The reversal of 3986869 is 9686893.

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: 9686893 = 1321 ⋅7333.

It is a cyclic number.

It is not a de Polignac number, because 3986869 - 2⁹ = 3986357 is a prime.

It is a super-2 number, since 2×3986869² = 31790248846322, 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 (3986809) 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, 42367 + ... + 42460.

It is an arithmetic number, because the mean of its divisors is an integer number (1017936).

Almost surely, 2^3986869 is an apocalyptic number.

It is an amenable number.

3986869 is a deficient number, since it is larger than the sum of its proper divisors (84875).

3986869 is an equidigital number, since it uses as much as digits as its factorization.

3986869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84874.

The product of its digits is 559872, while the sum is 49.

The square root of 3986869 is about 1996.7145514570. The cubic root of 3986869 is about 158.5662134166.

The spelling of 3986869 in words is "three million, nine hundred eighty-six thousand, eight hundred sixty-nine".