100138939 has 2 divisors, whose sum is σ = 100138940. Its totient is φ = 100138938.

The previous prime is 100138921. The next prime is 100138963. The reversal of 100138939 is 939831001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 100138939 - 2⁹ = 100138427 is a prime.

It is not a weakly prime, because it can be changed into another prime (100138979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50069469 + 50069470.

It is an arithmetic number, because the mean of its divisors is an integer number (50069470).

Almost surely, 2^100138939 is an apocalyptic number.

100138939 is a deficient number, since it is larger than the sum of its proper divisors (1).

100138939 is an equidigital number, since it uses as much as digits as its factorization.

100138939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 100138939 is about 10006.9445386691. The cubic root of 100138939 is about 464.3737497845.

The spelling of 100138939 in words is "one hundred million, one hundred thirty-eight thousand, nine hundred thirty-nine".