138913903 has 4 divisors (see below), whose sum is σ = 139045648. Its totient is φ = 138782160.

The previous prime is 138913889. The next prime is 138913913. The reversal of 138913903 is 309319831.

138913903 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138913903 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 (138913913) 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, 64278 + ... + 66403.

It is an arithmetic number, because the mean of its divisors is an integer number (34761412).

Almost surely, 2^138913903 is an apocalyptic number.

138913903 is a deficient number, since it is larger than the sum of its proper divisors (131745).

138913903 is a wasteful number, since it uses less digits than its factorization.

138913903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131744.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 138913903 is about 11786.1742308520. The cubic root of 138913903 is about 517.9031723230.

The spelling of 138913903 in words is "one hundred thirty-eight million, nine hundred thirteen thousand, nine hundred three".