138709813 has 8 divisors (see below), whose sum is σ = 156538080. Its totient is φ = 121751280.

The previous prime is 138709811. The next prime is 138709877. The reversal of 138709813 is 318907831.

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

It is not a de Polignac number, because 138709813 - 2¹ = 138709811 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 (138709811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217095 + ... + 217732.

It is an arithmetic number, because the mean of its divisors is an integer number (19567260).

Almost surely, 2^138709813 is an apocalyptic number.

It is an amenable number.

138709813 is a deficient number, since it is larger than the sum of its proper divisors (17828267).

138709813 is a wasteful number, since it uses less digits than its factorization.

138709813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434867.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 138709813 is about 11777.5130227056. The cubic root of 138709813 is about 517.6494164303.

The spelling of 138709813 in words is "one hundred thirty-eight million, seven hundred nine thousand, eight hundred thirteen".