128636923 has 2 divisors, whose sum is σ = 128636924. Its totient is φ = 128636922.

The previous prime is 128636899. The next prime is 128636929. The reversal of 128636923 is 329636821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128636923 is a prime.

It is not a weakly prime, because it can be changed into another prime (128636929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64318461 + 64318462.

It is an arithmetic number, because the mean of its divisors is an integer number (64318462).

Almost surely, 2^128636923 is an apocalyptic number.

128636923 is a deficient number, since it is larger than the sum of its proper divisors (1).

128636923 is an equidigital number, since it uses as much as digits as its factorization.

128636923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 40.

The square root of 128636923 is about 11341.8218554164. The cubic root of 128636923 is about 504.8029463517.

The spelling of 128636923 in words is "one hundred twenty-eight million, six hundred thirty-six thousand, nine hundred twenty-three".