2178823 has 2 divisors, whose sum is σ = 2178824. Its totient is φ = 2178822.

The previous prime is 2178797. The next prime is 2178829. The reversal of 2178823 is 3288712.

2178823 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2178823 - 2⁵ = 2178791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2178829) 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, 1089411 + 1089412.

It is an arithmetic number, because the mean of its divisors is an integer number (1089412).

2^2178823 is an apocalyptic number.

2178823 is a deficient number, since it is larger than the sum of its proper divisors (1).

2178823 is an equidigital number, since it uses as much as digits as its factorization.

2178823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 31.

The square root of 2178823 is about 1476.0836697152. The cubic root of 2178823 is about 129.6404859731.

The spelling of 2178823 in words is "two million, one hundred seventy-eight thousand, eight hundred twenty-three".