3686991 has 24 divisors (see below), whose sum is σ = 6179712. Its totient is φ = 1914000.

The previous prime is 3686989. The next prime is 3686999. The reversal of 3686991 is 1996863.

It is not a de Polignac number, because 3686991 - 2¹ = 3686989 is a prime.

3686991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3686999) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1816 + ... + 3266.

It is an arithmetic number, because the mean of its divisors is an integer number (257488).

Almost surely, 2^3686991 is an apocalyptic number.

3686991 is a deficient number, since it is larger than the sum of its proper divisors (2492721).

3686991 is a wasteful number, since it uses less digits than its factorization.

3686991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1483 (or 1472 counting only the distinct ones).

The product of its digits is 69984, while the sum is 42.

The square root of 3686991 is about 1920.1539000820. The cubic root of 3686991 is about 154.4865563653.

The spelling of 3686991 in words is "three million, six hundred eighty-six thousand, nine hundred ninety-one".