138905179 has 8 divisors (see below), whose sum is σ = 162440960. Its totient is φ = 116292456.

The previous prime is 138905083. The next prime is 138905183. The reversal of 138905179 is 971509831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138905179 - 2¹⁷ = 138774107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138905189) 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 7 ways as a sum of consecutive naturals, for example, 230439 + ... + 231040.

It is an arithmetic number, because the mean of its divisors is an integer number (20305120).

Almost surely, 2^138905179 is an apocalyptic number.

138905179 is a deficient number, since it is larger than the sum of its proper divisors (23535781).

138905179 is an equidigital number, since it uses as much as digits as its factorization.

138905179 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461529.

The product of its (nonzero) digits is 68040, while the sum is 43.

The square root of 138905179 is about 11785.8041303935. The cubic root of 138905179 is about 517.8923303992.

The spelling of 138905179 in words is "one hundred thirty-eight million, nine hundred five thousand, one hundred seventy-nine".