3687691 has 24 divisors (see below), whose sum is σ = 4801680. Its totient is φ = 2806272.

The previous prime is 3687683. The next prime is 3687703. The reversal of 3687691 is 1967863.

It is not a de Polignac number, because 3687691 - 2³ = 3687683 is a prime.

It is a super-2 number, since 2×3687691² = 27198129822962, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (3687631) 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, 15711 + ... + 15943.

It is an arithmetic number, because the mean of its divisors is an integer number (200070).

Almost surely, 2^3687691 is an apocalyptic number.

3687691 is a deficient number, since it is larger than the sum of its proper divisors (1113989).

3687691 is a wasteful number, since it uses less digits than its factorization.

3687691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283 (or 276 counting only the distinct ones).

The product of its digits is 54432, while the sum is 40.

The square root of 3687691 is about 1920.3361684872. The cubic root of 3687691 is about 154.4963325166.

The spelling of 3687691 in words is "three million, six hundred eighty-seven thousand, six hundred ninety-one".