3909791 has 4 divisors (see below), whose sum is σ = 3913752. Its totient is φ = 3905832.

The previous prime is 3909769. The next prime is 3909797. The reversal of 3909791 is 1979093.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 3909791 - 2¹⁰ = 3908767 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 (3909797) 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, 836 + ... + 2918.

It is an arithmetic number, because the mean of its divisors is an integer number (978438).

Almost surely, 2^3909791 is an apocalyptic number.

3909791 is a deficient number, since it is larger than the sum of its proper divisors (3961).

3909791 is a wasteful number, since it uses less digits than its factorization.

3909791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3960.

The product of its (nonzero) digits is 15309, while the sum is 38.

The square root of 3909791 is about 1977.3191447007. The cubic root of 3909791 is about 157.5377049226.

The spelling of 3909791 in words is "three million, nine hundred nine thousand, seven hundred ninety-one".