3687591 has 4 divisors (see below), whose sum is σ = 4916792. Its totient is φ = 2458392.

The previous prime is 3687583. The next prime is 3687631. The reversal of 3687591 is 1957863.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1957863 = 3 ⋅652621.

It is not a de Polignac number, because 3687591 - 2³ = 3687583 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3687391) 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, 614596 + ... + 614601.

It is an arithmetic number, because the mean of its divisors is an integer number (1229198).

Almost surely, 2^3687591 is an apocalyptic number.

3687591 is a deficient number, since it is larger than the sum of its proper divisors (1229201).

3687591 is a wasteful number, since it uses less digits than its factorization.

3687591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1229200.

The product of its digits is 45360, while the sum is 39.

The square root of 3687591 is about 1920.3101312028. The cubic root of 3687591 is about 154.4949359993.

It can be divided in two parts, 3687 and 591, that added together give a triangular number (4278 = T₉₂).

The spelling of 3687591 in words is "three million, six hundred eighty-seven thousand, five hundred ninety-one".