3997689 has 8 divisors (see below), whose sum is σ = 5410080. Its totient is φ = 2625216.

The previous prime is 3997673. The next prime is 3997723. The reversal of 3997689 is 9867993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3997689 - 2⁴ = 3997673 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (3997639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9744 + ... + 10145.

It is an arithmetic number, because the mean of its divisors is an integer number (676260).

Almost surely, 2^3997689 is an apocalyptic number.

It is an amenable number.

3997689 is a deficient number, since it is larger than the sum of its proper divisors (1412391).

3997689 is a wasteful number, since it uses less digits than its factorization.

3997689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19959.

The product of its digits is 734832, while the sum is 51.

The square root of 3997689 is about 1999.4221665271. The cubic root of 3997689 is about 158.7095286089.

The spelling of 3997689 in words is "three million, nine hundred ninety-seven thousand, six hundred eighty-nine".