3981291 has 8 divisors (see below), whose sum is σ = 5322240. Its totient is φ = 2647272.

The previous prime is 3981253. The next prime is 3981301. The reversal of 3981291 is 1921893.

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

It is not a de Polignac number, because 3981291 - 2⁶ = 3981227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3981191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195 + ... + 2828.

It is an arithmetic number, because the mean of its divisors is an integer number (665280).

Almost surely, 2^3981291 is an apocalyptic number.

3981291 is a deficient number, since it is larger than the sum of its proper divisors (1340949).

3981291 is a wasteful number, since it uses less digits than its factorization.

3981291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3465.

The product of its digits is 3888, while the sum is 33.

The square root of 3981291 is about 1995.3172680053. The cubic root of 3981291 is about 158.4922292826.

It can be divided in two parts, 39812 and 91, that added together give a triangular number (39903 = T₂₈₂).

The spelling of 3981291 in words is "three million, nine hundred eighty-one thousand, two hundred ninety-one".