3686993 has 4 divisors (see below), whose sum is σ = 3691008. Its totient is φ = 3682980.

The previous prime is 3686989. The next prime is 3686999. The reversal of 3686993 is 3996863.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3996863 = 13 ⋅307451.

It is a cyclic number.

It is not a de Polignac number, because 3686993 - 2² = 3686989 is a prime.

It is a Duffinian number.

It is a Curzon 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 3 ways as a sum of consecutive naturals, for example, 128 + ... + 2718.

It is an arithmetic number, because the mean of its divisors is an integer number (922752).

Almost surely, 2^3686993 is an apocalyptic number.

It is an amenable number.

3686993 is a deficient number, since it is larger than the sum of its proper divisors (4015).

3686993 is a wasteful number, since it uses less digits than its factorization.

3686993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4014.

The product of its digits is 209952, while the sum is 44.

The square root of 3686993 is about 1920.1544208735. The cubic root of 3686993 is about 154.4865842989.

The spelling of 3686993 in words is "three million, six hundred eighty-six thousand, nine hundred ninety-three".