3991113 has 20 divisors (see below), whose sum is σ = 6814720. Its totient is φ = 2280312.

The previous prime is 3991111. The next prime is 3991139. The reversal of 3991113 is 3111993.

It is not a de Polignac number, because 3991113 - 2¹ = 3991111 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3991111) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2953 + ... + 4086.

It is an arithmetic number, because the mean of its divisors is an integer number (340736).

Almost surely, 2^3991113 is an apocalyptic number.

It is an amenable number.

3991113 is a deficient number, since it is larger than the sum of its proper divisors (2823607).

3991113 is an equidigital number, since it uses as much as digits as its factorization.

3991113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7058 (or 7049 counting only the distinct ones).

The product of its digits is 729, while the sum is 27.

The square root of 3991113 is about 1997.7770145840. Note that the first 3 decimals coincide. The cubic root of 3991113 is about 158.6224577498.

The spelling of 3991113 in words is "three million, nine hundred ninety-one thousand, one hundred thirteen".