138844955 has 4 divisors (see below), whose sum is σ = 166613952. Its totient is φ = 111075960.

The previous prime is 138844943. The next prime is 138844957. The reversal of 138844955 is 559448831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 138844955 - 2⁶ = 138844891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138844957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13884491 + ... + 13884500.

It is an arithmetic number, because the mean of its divisors is an integer number (41653488).

Almost surely, 2^138844955 is an apocalyptic number.

138844955 is a deficient number, since it is larger than the sum of its proper divisors (27768997).

138844955 is an equidigital number, since it uses as much as digits as its factorization.

138844955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27768996.

The product of its digits is 691200, while the sum is 47.

The square root of 138844955 is about 11783.2489153035. The cubic root of 138844955 is about 517.8174734439.

The spelling of 138844955 in words is "one hundred thirty-eight million, eight hundred forty-four thousand, nine hundred fifty-five".