3911891 has 8 divisors (see below), whose sum is σ = 4140480. Its totient is φ = 3685608.

The previous prime is 3911881. The next prime is 3911911. The reversal of 3911891 is 1981193.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3911891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3911821) 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 7 ways as a sum of consecutive naturals, for example, 3860 + ... + 4766.

It is an arithmetic number, because the mean of its divisors is an integer number (517560).

Almost surely, 2^3911891 is an apocalyptic number.

3911891 is a deficient number, since it is larger than the sum of its proper divisors (228589).

3911891 is a wasteful number, since it uses less digits than its factorization.

3911891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1153.

The product of its digits is 1944, while the sum is 32.

The square root of 3911891 is about 1977.8500954319. The cubic root of 3911891 is about 157.5659050632.

The spelling of 3911891 in words is "three million, nine hundred eleven thousand, eight hundred ninety-one".