3997817 has 4 divisors (see below), whose sum is σ = 4016976. Its totient is φ = 3978660.

The previous prime is 3997811. The next prime is 3997849. The reversal of 3997817 is 7187993.

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 not a de Polignac number, because 3997817 - 2⁴ = 3997801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3997811) 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, 9263 + ... + 9684.

It is an arithmetic number, because the mean of its divisors is an integer number (1004244).

Almost surely, 2^3997817 is an apocalyptic number.

It is an amenable number.

3997817 is a deficient number, since it is larger than the sum of its proper divisors (19159).

3997817 is a wasteful number, since it uses less digits than its factorization.

3997817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19158.

The product of its digits is 95256, while the sum is 44.

The square root of 3997817 is about 1999.4541755189. The cubic root of 3997817 is about 158.7112224711.

The spelling of 3997817 in words is "three million, nine hundred ninety-seven thousand, eight hundred seventeen".