3963891 has 8 divisors (see below), whose sum is σ = 5294800. Its totient is φ = 2637792.

The previous prime is 3963887. The next prime is 3963893. The reversal of 3963891 is 1983693.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3963891 - 2² = 3963887 is a prime.

It is an Ulam 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 (3963893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1785 + ... + 3333.

It is an arithmetic number, because the mean of its divisors is an integer number (661850).

Almost surely, 2^3963891 is an apocalyptic number.

3963891 is a deficient number, since it is larger than the sum of its proper divisors (1330909).

3963891 is a wasteful number, since it uses less digits than its factorization.

3963891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2405.

The product of its digits is 34992, while the sum is 39.

The square root of 3963891 is about 1990.9522847120. The cubic root of 3963891 is about 158.2609984145.

The spelling of 3963891 in words is "three million, nine hundred sixty-three thousand, eight hundred ninety-one".