3218679389 has 4 divisors (see below), whose sum is σ = 3218939100. Its totient is φ = 3218419680.

The previous prime is 3218679361. The next prime is 3218679407. The reversal of 3218679389 is 9839768123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9839768123 = 37 ⋅265939679.

It can be written as a sum of positive squares in 2 ways, for example, as 2419656100 + 799023289 = 49190^2 + 28267^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3218679389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3218679329) 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, 110282 + ... + 136379.

It is an arithmetic number, because the mean of its divisors is an integer number (804734775).

Almost surely, 2^3218679389 is an apocalyptic number.

It is an amenable number.

3218679389 is a deficient number, since it is larger than the sum of its proper divisors (259711).

3218679389 is a wasteful number, since it uses less digits than its factorization.

3218679389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259710.

The product of its digits is 3919104, while the sum is 56.

The square root of 3218679389 is about 56733.4062876538. The cubic root of 3218679389 is about 1476.4743490797.

The spelling of 3218679389 in words is "three billion, two hundred eighteen million, six hundred seventy-nine thousand, three hundred eighty-nine".