3878415689 has 2 divisors, whose sum is σ = 3878415690. Its totient is φ = 3878415688.

The previous prime is 3878415661. The next prime is 3878415721. The reversal of 3878415689 is 9865148783.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3351483664 + 526932025 = 57892^2 + 22955^2 .

It is a cyclic number.

It is not a de Polignac number, because 3878415689 - 2¹⁶ = 3878350153 is a prime.

It is not a weakly prime, because it can be changed into another prime (3878418689) 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 as a sum of consecutive naturals, namely, 1939207844 + 1939207845.

It is an arithmetic number, because the mean of its divisors is an integer number (1939207845).

Almost surely, 2^3878415689 is an apocalyptic number.

It is an amenable number.

3878415689 is a deficient number, since it is larger than the sum of its proper divisors (1).

3878415689 is an equidigital number, since it uses as much as digits as its factorization.

3878415689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11612160, while the sum is 59.

The square root of 3878415689 is about 62276.9274209960. The cubic root of 3878415689 is about 1571.1516951493.

The spelling of 3878415689 in words is "three billion, eight hundred seventy-eight million, four hundred fifteen thousand, six hundred eighty-nine".