3968849569 has 4 divisors (see below), whose sum is σ = 4065650820. Its totient is φ = 3872048320.

The previous prime is 3968849567. The next prime is 3968849581. The reversal of 3968849569 is 9659488693.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9659488693 = 29 ⋅333085817.

It can be written as a sum of positive squares in 2 ways, for example, as 2312359569 + 1656490000 = 48087^2 + 40700^2 .

It is a cyclic number.

It is not a de Polignac number, because 3968849569 - 2¹ = 3968849567 is a prime.

It is a super-2 number, since 2×3968849569² = 31503533802702971522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3968849567) 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, 48400564 + ... + 48400645.

It is an arithmetic number, because the mean of its divisors is an integer number (1016412705).

Almost surely, 2^3968849569 is an apocalyptic number.

It is an amenable number.

3968849569 is a deficient number, since it is larger than the sum of its proper divisors (96801251).

3968849569 is an equidigital number, since it uses as much as digits as its factorization.

3968849569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96801250.

The product of its digits is 100776960, while the sum is 67.

The square root of 3968849569 is about 62998.8060918618. The cubic root of 3968849569 is about 1583.2696231084.

The spelling of 3968849569 in words is "three billion, nine hundred sixty-eight million, eight hundred forty-nine thousand, five hundred sixty-nine".