3878209 has 2 divisors, whose sum is σ = 3878210. Its totient is φ = 3878208.

The previous prime is 3878207. The next prime is 3878219. The reversal of 3878209 is 9028783.

3878209 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 can be written as a sum of positive squares in only one way, i.e., 3459600 + 418609 = 1860^2 + 647^2 .

It is a cyclic number.

It is not a de Polignac number, because 3878209 - 2¹ = 3878207 is a prime.

Together with 3878207, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3878207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1939104 + 1939105.

It is an arithmetic number, because the mean of its divisors is an integer number (1939105).

Almost surely, 2^3878209 is an apocalyptic number.

It is an amenable number.

3878209 is a deficient number, since it is larger than the sum of its proper divisors (1).

3878209 is an equidigital number, since it uses as much as digits as its factorization.

3878209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 3878209 is about 1969.3168866386. The cubic root of 3878209 is about 157.1123784651.

The spelling of 3878209 in words is "three million, eight hundred seventy-eight thousand, two hundred nine".