3878197409 has 2 divisors, whose sum is σ = 3878197410. Its totient is φ = 3878197408.

The previous prime is 3878197321. The next prime is 3878197441. The reversal of 3878197409 is 9047918783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2801373184 + 1076824225 = 52928^2 + 32815^2 .

It is a cyclic number.

It is not a de Polignac number, because 3878197409 - 2⁸ = 3878197153 is a prime.

It is not a weakly prime, because it can be changed into another prime (3878197459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1939098704 + 1939098705.

It is an arithmetic number, because the mean of its divisors is an integer number (1939098705).

Almost surely, 2^3878197409 is an apocalyptic number.

It is an amenable number.

3878197409 is a deficient number, since it is larger than the sum of its proper divisors (1).

3878197409 is an equidigital number, since it uses as much as digits as its factorization.

3878197409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3048192, while the sum is 56.

The square root of 3878197409 is about 62275.1749014003. The cubic root of 3878197409 is about 1571.1222194171.

The spelling of 3878197409 in words is "three billion, eight hundred seventy-eight million, one hundred ninety-seven thousand, four hundred nine".