3686861 has 4 divisors (see below), whose sum is σ = 3805824. Its totient is φ = 3567900.

The previous prime is 3686849. The next prime is 3686867. The reversal of 3686861 is 1686863.

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: 1686863 = 41 ⋅41143.

It is a cyclic number.

It is not a de Polignac number, because 3686861 - 2⁶ = 3686797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3686867) 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, 59435 + ... + 59496.

It is an arithmetic number, because the mean of its divisors is an integer number (951456).

Almost surely, 2^3686861 is an apocalyptic number.

3686861 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3686861 is a deficient number, since it is larger than the sum of its proper divisors (118963).

3686861 is a wasteful number, since it uses less digits than its factorization.

3686861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118962.

The product of its digits is 41472, while the sum is 38.

The square root of 3686861 is about 1920.1200483303. The cubic root of 3686861 is about 154.4847406581.

The spelling of 3686861 in words is "three million, six hundred eighty-six thousand, eight hundred sixty-one".