2078378243 has 4 divisors (see below), whose sum is σ = 2107651248. Its totient is φ = 2049105240.

The previous prime is 2078378227. The next prime is 2078378249. The reversal of 2078378243 is 3428738702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3428738702 = 2 ⋅1714369351.

It is a cyclic number.

It is not a de Polignac number, because 2078378243 - 2⁴ = 2078378227 is a prime.

It is a super-2 number, since 2×2078378243² = 8639312241951534098, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2078378194 and 2078378203.

It is not an unprimeable number, because it can be changed into a prime (2078378249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14636396 + ... + 14636537.

It is an arithmetic number, because the mean of its divisors is an integer number (526912812).

Almost surely, 2^2078378243 is an apocalyptic number.

2078378243 is a deficient number, since it is larger than the sum of its proper divisors (29273005).

2078378243 is an equidigital number, since it uses as much as digits as its factorization.

2078378243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29273004.

The product of its (nonzero) digits is 451584, while the sum is 44.

The square root of 2078378243 is about 45589.2338496711. The cubic root of 2078378243 is about 1276.1690148249.

The spelling of 2078378243 in words is "two billion, seventy-eight million, three hundred seventy-eight thousand, two hundred forty-three".