3997867 has 4 divisors (see below), whose sum is σ = 4082976. Its totient is φ = 3912760.

The previous prime is 3997859. The next prime is 3997871. The reversal of 3997867 is 7687993.

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 3997867 - 2³ = 3997859 is a prime.

It is an Ulam number.

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 3997867.

It is not an unprimeable number, because it can be changed into a prime (3997897) 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, 42484 + ... + 42577.

It is an arithmetic number, because the mean of its divisors is an integer number (1020744).

Almost surely, 2^3997867 is an apocalyptic number.

3997867 is a deficient number, since it is larger than the sum of its proper divisors (85109).

3997867 is an equidigital number, since it uses as much as digits as its factorization.

3997867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85108.

The product of its digits is 571536, while the sum is 49.

The square root of 3997867 is about 1999.4666788921. The cubic root of 3997867 is about 158.7118841262.

The spelling of 3997867 in words is "three million, nine hundred ninety-seven thousand, eight hundred sixty-seven".