3217439845 has 4 divisors (see below), whose sum is σ = 3860927820. Its totient is φ = 2573951872.

The previous prime is 3217439843. The next prime is 3217439857. The reversal of 3217439845 is 5489347123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5489347123 = 13 ⋅422257471.

It can be written as a sum of positive squares in 2 ways, for example, as 1333272196 + 1884167649 = 36514^2 + 43407^2 .

It is a cyclic number.

It is not a de Polignac number, because 3217439845 - 2¹ = 3217439843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3217439795 and 3217439804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3217439843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321743980 + ... + 321743989.

It is an arithmetic number, because the mean of its divisors is an integer number (965231955).

Almost surely, 2^3217439845 is an apocalyptic number.

It is an amenable number.

3217439845 is a deficient number, since it is larger than the sum of its proper divisors (643487975).

3217439845 is an equidigital number, since it uses as much as digits as its factorization.

3217439845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643487974.

The product of its digits is 725760, while the sum is 46.

The square root of 3217439845 is about 56722.4809489148. The cubic root of 3217439845 is about 1476.2847899794.

The spelling of 3217439845 in words is "three billion, two hundred seventeen million, four hundred thirty-nine thousand, eight hundred forty-five".