3643687 has 4 divisors (see below), whose sum is σ = 3835480. Its totient is φ = 3451896.

The previous prime is 3643681. The next prime is 3643699. The reversal of 3643687 is 7863463.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7863463 = 71 ⋅110753.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3643687 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 (3643681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95868 + ... + 95905.

It is an arithmetic number, because the mean of its divisors is an integer number (958870).

Almost surely, 2^3643687 is an apocalyptic number.

3643687 is a deficient number, since it is larger than the sum of its proper divisors (191793).

3643687 is a wasteful number, since it uses less digits than its factorization.

3643687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191792.

The product of its digits is 72576, while the sum is 37.

The square root of 3643687 is about 1908.8444148227. The cubic root of 3643687 is about 153.8793539823.

Subtracting from 3643687 its sum of digits (37), we obtain a triangular number (3643650 = T₂₆₉₉).

The spelling of 3643687 in words is "three million, six hundred forty-three thousand, six hundred eighty-seven".