3873891 has 36 divisors (see below), whose sum is σ = 6428232. Its totient is φ = 2068416.

The previous prime is 3873871. The next prime is 3873893. The reversal of 3873891 is 1983783.

It is not a de Polignac number, because 3873891 - 2⁹ = 3873379 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3873893) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 53031 + ... + 53103.

It is an arithmetic number, because the mean of its divisors is an integer number (178562).

Almost surely, 2^3873891 is an apocalyptic number.

3873891 is a deficient number, since it is larger than the sum of its proper divisors (2554341).

3873891 is a wasteful number, since it uses less digits than its factorization.

3873891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 102 counting only the distinct ones).

The product of its digits is 36288, while the sum is 39.

The square root of 3873891 is about 1968.2202620642. The cubic root of 3873891 is about 157.0540471420.

It can be divided in two parts, 387 and 3891, that added together give a triangular number (4278 = T₉₂).

The spelling of 3873891 in words is "three million, eight hundred seventy-three thousand, eight hundred ninety-one".