138520718 has 8 divisors (see below), whose sum is σ = 237464112. Its totient is φ = 59366016.

The previous prime is 138520717. The next prime is 138520721. The reversal of 138520718 is 817025831.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138520717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4947155 + ... + 4947182.

It is an arithmetic number, because the mean of its divisors is an integer number (29683014).

Almost surely, 2^138520718 is an apocalyptic number.

138520718 is a deficient number, since it is larger than the sum of its proper divisors (98943394).

138520718 is an equidigital number, since it uses as much as digits as its factorization.

138520718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9894346.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 138520718 is about 11769.4824864987. The cubic root of 138520718 is about 517.4140823703.

The spelling of 138520718 in words is "one hundred thirty-eight million, five hundred twenty thousand, seven hundred eighteen".