3218689 has 4 divisors (see below), whose sum is σ = 3358656. Its totient is φ = 3078724.

The previous prime is 3218669. The next prime is 3218693. The reversal of 3218689 is 9868123.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9868123 = 53 ⋅186191.

It is a cyclic number.

It is not a de Polignac number, because 3218689 - 2¹⁵ = 3185921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3218609) 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, 69949 + ... + 69994.

It is an arithmetic number, because the mean of its divisors is an integer number (839664).

Almost surely, 2^3218689 is an apocalyptic number.

It is an amenable number.

3218689 is a deficient number, since it is larger than the sum of its proper divisors (139967).

3218689 is a wasteful number, since it uses less digits than its factorization.

3218689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139966.

The product of its digits is 20736, while the sum is 37.

The square root of 3218689 is about 1794.0705114348. The cubic root of 3218689 is about 147.6475818666.

It can be divided in two parts, 32 and 18689, that added together give a triangular number (18721 = T₁₉₃).

The spelling of 3218689 in words is "three million, two hundred eighteen thousand, six hundred eighty-nine".