3991267 has 4 divisors (see below), whose sum is σ = 4561456. Its totient is φ = 3421080.

The previous prime is 3991261. The next prime is 3991279. The reversal of 3991267 is 7621993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7621993 = 23 ⋅331391.

It is a cyclic number.

It is not a de Polignac number, because 3991267 - 2⁷ = 3991139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3991261) 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, 285084 + ... + 285097.

It is an arithmetic number, because the mean of its divisors is an integer number (1140364).

Almost surely, 2^3991267 is an apocalyptic number.

3991267 is a deficient number, since it is larger than the sum of its proper divisors (570189).

3991267 is an equidigital number, since it uses as much as digits as its factorization.

3991267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570188.

The product of its digits is 20412, while the sum is 37.

The square root of 3991267 is about 1997.8155570523. The cubic root of 3991267 is about 158.6244979112.

The spelling of 3991267 in words is "three million, nine hundred ninety-one thousand, two hundred sixty-seven".