2078378209 has 2 divisors, whose sum is σ = 2078378210. Its totient is φ = 2078378208.

The previous prime is 2078378201. The next prime is 2078378219. The reversal of 2078378209 is 9028738702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1834237584 + 244140625 = 42828^2 + 15625^2 .

It is a cyclic number.

It is not a de Polignac number, because 2078378209 - 2³ = 2078378201 is a prime.

It is not a weakly prime, because it can be changed into another prime (2078378201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1039189104 + 1039189105.

It is an arithmetic number, because the mean of its divisors is an integer number (1039189105).

Almost surely, 2^2078378209 is an apocalyptic number.

It is an amenable number.

2078378209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2078378209 is an equidigital number, since it uses as much as digits as its factorization.

2078378209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 46.

The square root of 2078378209 is about 45589.2334767761. The cubic root of 2078378209 is about 1276.1690078660.

The spelling of 2078378209 in words is "two billion, seventy-eight million, three hundred seventy-eight thousand, two hundred nine".