7878223 has 4 divisors (see below), whose sum is σ = 7895920. Its totient is φ = 7860528.

The previous prime is 7878197. The next prime is 7878229. The reversal of 7878223 is 3228787.

7878223 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3228787 = 1423 ⋅2269.

It is a cyclic number.

It is not a de Polignac number, because 7878223 - 2⁹ = 7877711 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7878229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8163 + ... + 9076.

It is an arithmetic number, because the mean of its divisors is an integer number (1973980).

Almost surely, 2^7878223 is an apocalyptic number.

7878223 is a deficient number, since it is larger than the sum of its proper divisors (17697).

7878223 is a wasteful number, since it uses less digits than its factorization.

7878223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17696.

The product of its digits is 37632, while the sum is 37.

The square root of 7878223 is about 2806.8172366579. The cubic root of 7878223 is about 198.9799984948.

The spelling of 7878223 in words is "seven million, eight hundred seventy-eight thousand, two hundred twenty-three".