128047823 has 2 divisors, whose sum is σ = 128047824. Its totient is φ = 128047822.

The previous prime is 128047819. The next prime is 128047837. The reversal of 128047823 is 328740821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128047823 - 2² = 128047819 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128047813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64023911 + 64023912.

It is an arithmetic number, because the mean of its divisors is an integer number (64023912).

Almost surely, 2^128047823 is an apocalyptic number.

128047823 is a deficient number, since it is larger than the sum of its proper divisors (1).

128047823 is an equidigital number, since it uses as much as digits as its factorization.

128047823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 128047823 is about 11315.8217995866. The cubic root of 128047823 is about 504.0311758976.

The spelling of 128047823 in words is "one hundred twenty-eight million, forty-seven thousand, eight hundred twenty-three".