3997843 has 4 divisors (see below), whose sum is σ = 4073328. Its totient is φ = 3922360.

The previous prime is 3997811. The next prime is 3997849. The reversal of 3997843 is 3487993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3997843 - 2⁵ = 3997811 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3997843.

It is not an unprimeable number, because it can be changed into a prime (3997849) 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, 37663 + ... + 37768.

It is an arithmetic number, because the mean of its divisors is an integer number (1018332).

Almost surely, 2^3997843 is an apocalyptic number.

3997843 is a deficient number, since it is larger than the sum of its proper divisors (75485).

3997843 is an equidigital number, since it uses as much as digits as its factorization.

3997843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75484.

The product of its digits is 163296, while the sum is 43.

The square root of 3997843 is about 1999.4606772828. The cubic root of 3997843 is about 158.7115665325.

The spelling of 3997843 in words is "three million, nine hundred ninety-seven thousand, eight hundred forty-three".