3891959 has 4 divisors (see below), whose sum is σ = 3898416. Its totient is φ = 3885504.

The previous prime is 3891917. The next prime is 3891971. The reversal of 3891959 is 9591983.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3891959 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 (3891259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2219 + ... + 3564.

It is an arithmetic number, because the mean of its divisors is an integer number (974604).

Almost surely, 2^3891959 is an apocalyptic number.

3891959 is a deficient number, since it is larger than the sum of its proper divisors (6457).

3891959 is an equidigital number, since it uses as much as digits as its factorization.

3891959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6456.

The product of its digits is 87480, while the sum is 44.

The square root of 3891959 is about 1972.8048560362. The cubic root of 3891959 is about 157.2978375389.

The spelling of 3891959 in words is "three million, eight hundred ninety-one thousand, nine hundred fifty-nine".