3878431939 has 2 divisors, whose sum is σ = 3878431940. Its totient is φ = 3878431938.

The previous prime is 3878431919. The next prime is 3878431967. The reversal of 3878431939 is 9391348783.

It is a happy number.

3878431939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3878431939 - 2¹⁹ = 3877907651 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3878431939.

It is not a weakly prime, because it can be changed into another prime (3878431919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1939215969 + 1939215970.

It is an arithmetic number, because the mean of its divisors is an integer number (1939215970).

Almost surely, 2^3878431939 is an apocalyptic number.

3878431939 is a deficient number, since it is larger than the sum of its proper divisors (1).

3878431939 is an equidigital number, since it uses as much as digits as its factorization.

3878431939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 55.

The square root of 3878431939 is about 62277.0578865123. The cubic root of 3878431939 is about 1571.1538894456.

The spelling of 3878431939 in words is "three billion, eight hundred seventy-eight million, four hundred thirty-one thousand, nine hundred thirty-nine".