138700191 has 8 divisors (see below), whose sum is σ = 211352704. Its totient is φ = 79257240.

The previous prime is 138700187. The next prime is 138700193. The reversal of 138700191 is 191007831.

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

It is not a de Polignac number, because 138700191 - 2² = 138700187 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138700193) 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, 3302365 + ... + 3302406.

It is an arithmetic number, because the mean of its divisors is an integer number (26419088).

Almost surely, 2^138700191 is an apocalyptic number.

138700191 is a deficient number, since it is larger than the sum of its proper divisors (72652513).

138700191 is an equidigital number, since it uses as much as digits as its factorization.

138700191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6604781.

The product of its (nonzero) digits is 1512, while the sum is 30.

The square root of 138700191 is about 11777.1045253067. The cubic root of 138700191 is about 517.6374467464.

The spelling of 138700191 in words is "one hundred thirty-eight million, seven hundred thousand, one hundred ninety-one".