3997841 has 4 divisors (see below), whose sum is σ = 4035312. Its totient is φ = 3960372.

The previous prime is 3997811. The next prime is 3997849. The reversal of 3997841 is 1487993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3997841 is a prime.

It is a super-2 number, since 2×3997841² = 31965465322562, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

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, 18575 + ... + 18788.

It is an arithmetic number, because the mean of its divisors is an integer number (1008828).

Almost surely, 2^3997841 is an apocalyptic number.

It is an amenable number.

3997841 is a deficient number, since it is larger than the sum of its proper divisors (37471).

3997841 is a wasteful number, since it uses less digits than its factorization.

3997841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37470.

The product of its digits is 54432, while the sum is 41.

The square root of 3997841 is about 1999.4601771478. The cubic root of 3997841 is about 158.7115400663.

The spelling of 3997841 in words is "three million, nine hundred ninety-seven thousand, eight hundred forty-one".