3968689 has 4 divisors (see below), whose sum is σ = 3985956. Its totient is φ = 3951424.

The previous prime is 3968669. The next prime is 3968717. The reversal of 3968689 is 9868693.

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

It can be written as a sum of positive squares in 2 ways, for example, as 846400 + 3122289 = 920^2 + 1767^2 .

It is a cyclic number.

It is not a de Polignac number, because 3968689 - 2⁹ = 3968177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3968669) 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, 8284 + ... + 8749.

It is an arithmetic number, because the mean of its divisors is an integer number (996489).

Almost surely, 2^3968689 is an apocalyptic number.

It is an amenable number.

3968689 is a deficient number, since it is larger than the sum of its proper divisors (17267).

3968689 is a wasteful number, since it uses less digits than its factorization.

3968689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17266.

The product of its digits is 559872, while the sum is 49.

The square root of 3968689 is about 1992.1568713332. The cubic root of 3968689 is about 158.3248271207.

The spelling of 3968689 in words is "three million, nine hundred sixty-eight thousand, six hundred eighty-nine".