3840209915 has 4 divisors (see below), whose sum is σ = 4608251904. Its totient is φ = 3072167928.

The previous prime is 3840209911. The next prime is 3840209953. The reversal of 3840209915 is 5199020483.

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

It is a cyclic number.

It is not a de Polignac number, because 3840209915 - 2² = 3840209911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3840209911) 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, 384020987 + ... + 384020996.

It is an arithmetic number, because the mean of its divisors is an integer number (1152062976).

Almost surely, 2^3840209915 is an apocalyptic number.

3840209915 is a deficient number, since it is larger than the sum of its proper divisors (768041989).

3840209915 is an equidigital number, since it uses as much as digits as its factorization.

3840209915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768041988.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 3840209915 is about 61969.4272605452. The cubic root of 3840209915 is about 1565.9755903032.

The spelling of 3840209915 in words is "three billion, eight hundred forty million, two hundred nine thousand, nine hundred fifteen".