3949891 has 8 divisors (see below), whose sum is σ = 4536000. Its totient is φ = 3401640.

The previous prime is 3949889. The next prime is 3949903. The reversal of 3949891 is 1989493.

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

It is not a de Polignac number, because 3949891 - 2¹ = 3949889 is a prime.

It is a Duffinian number.

3949891 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3949871) 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, 9241 + ... + 9658.

It is an arithmetic number, because the mean of its divisors is an integer number (567000).

Almost surely, 2^3949891 is an apocalyptic number.

3949891 is a deficient number, since it is larger than the sum of its proper divisors (586109).

3949891 is a wasteful number, since it uses less digits than its factorization.

3949891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18929.

The product of its digits is 69984, while the sum is 43.

The square root of 3949891 is about 1987.4332693200. The cubic root of 3949891 is about 158.0744588431.

The spelling of 3949891 in words is "three million, nine hundred forty-nine thousand, eight hundred ninety-one".