138708503 has 4 divisors (see below), whose sum is σ = 138743928. Its totient is φ = 138673080.

The previous prime is 138708481. The next prime is 138708509. The reversal of 138708503 is 305807831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138708503 - 2⁶ = 138708439 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 (138708509) 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, 10988 + ... + 19953.

It is an arithmetic number, because the mean of its divisors is an integer number (34685982).

Almost surely, 2^138708503 is an apocalyptic number.

138708503 is a deficient number, since it is larger than the sum of its proper divisors (35425).

138708503 is an equidigital number, since it uses as much as digits as its factorization.

138708503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35424.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 138708503 is about 11777.4574081166. The cubic root of 138708503 is about 517.6477868343.

The spelling of 138708503 in words is "one hundred thirty-eight million, seven hundred eight thousand, five hundred three".