138005786 has 8 divisors (see below), whose sum is σ = 209018784. Its totient is φ = 68332860.

The previous prime is 138005783. The next prime is 138005801. The reversal of 138005786 is 687500831.

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

It is not an unprimeable number, because it can be changed into a prime (138005783) 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, 334760 + ... + 335171.

It is an arithmetic number, because the mean of its divisors is an integer number (26127348).

Almost surely, 2^138005786 is an apocalyptic number.

138005786 is a deficient number, since it is larger than the sum of its proper divisors (71012998).

138005786 is a wasteful number, since it uses less digits than its factorization.

138005786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670036.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 138005786 is about 11747.5863904038. The cubic root of 138005786 is about 516.7721473621.

The spelling of 138005786 in words is "one hundred thirty-eight million, five thousand, seven hundred eighty-six".