3687891 has 4 divisors (see below), whose sum is σ = 4917192. Its totient is φ = 2458592.

The previous prime is 3687869. The next prime is 3687911. The reversal of 3687891 is 1987863.

3687891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3687891 - 2⁷ = 3687763 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (3687391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 614646 + ... + 614651.

It is an arithmetic number, because the mean of its divisors is an integer number (1229298).

Almost surely, 2^3687891 is an apocalyptic number.

3687891 is a deficient number, since it is larger than the sum of its proper divisors (1229301).

3687891 is a wasteful number, since it uses less digits than its factorization.

3687891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229300.

The product of its digits is 72576, while the sum is 42.

The square root of 3687891 is about 1920.3882419969. The cubic root of 3687891 is about 154.4991254755.

The spelling of 3687891 in words is "three million, six hundred eighty-seven thousand, eight hundred ninety-one".