108638939 has 2 divisors, whose sum is σ = 108638940. Its totient is φ = 108638938.

The previous prime is 108638917. The next prime is 108638947. The reversal of 108638939 is 939836801.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 108638939 - 2¹⁶ = 108573403 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 108638893 and 108638902.

It is not a weakly prime, because it can be changed into another prime (108628939) 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, 54319469 + 54319470.

It is an arithmetic number, because the mean of its divisors is an integer number (54319470).

Almost surely, 2^108638939 is an apocalyptic number.

108638939 is a deficient number, since it is larger than the sum of its proper divisors (1).

108638939 is an equidigital number, since it uses as much as digits as its factorization.

108638939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 108638939 is about 10423.0004797083. Note that the first 3 decimals coincide. The cubic root of 108638939 is about 477.1575923021.

The spelling of 108638939 in words is "one hundred eight million, six hundred thirty-eight thousand, nine hundred thirty-nine".