3872878909 has 4 divisors (see below), whose sum is σ = 3873581404. Its totient is φ = 3872176416.

The previous prime is 3872878903. The next prime is 3872878931. The reversal of 3872878909 is 9098782783.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2242496025 + 1630382884 = 47355^2 + 40378^2 .

It is a cyclic number.

It is not a de Polignac number, because 3872878909 - 2⁷ = 3872878781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3872878903) 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, 342912 + ... + 354025.

It is an arithmetic number, because the mean of its divisors is an integer number (968395351).

Almost surely, 2^3872878909 is an apocalyptic number.

It is an amenable number.

3872878909 is a deficient number, since it is larger than the sum of its proper divisors (702495).

3872878909 is an equidigital number, since it uses as much as digits as its factorization.

3872878909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702494.

The product of its (nonzero) digits is 12192768, while the sum is 61.

The square root of 3872878909 is about 62232.4586449869. The cubic root of 3872878909 is about 1570.4036866106.

The spelling of 3872878909 in words is "three billion, eight hundred seventy-two million, eight hundred seventy-eight thousand, nine hundred nine".