138555903 has 4 divisors (see below), whose sum is σ = 184741208. Its totient is φ = 92370600.

The previous prime is 138555871. The next prime is 138555913. The reversal of 138555903 is 309555831.

It is a happy number.

138555903 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 not a de Polignac number, because 138555903 - 2⁵ = 138555871 is a prime.

It is a super-2 number, since 2×138555903² = 38395476512290818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138555913) 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, 23092648 + ... + 23092653.

It is an arithmetic number, because the mean of its divisors is an integer number (46185302).

Almost surely, 2^138555903 is an apocalyptic number.

138555903 is a deficient number, since it is larger than the sum of its proper divisors (46185305).

138555903 is an equidigital number, since it uses as much as digits as its factorization.

138555903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46185304.

The product of its (nonzero) digits is 81000, while the sum is 39.

The square root of 138555903 is about 11770.9771472041. The cubic root of 138555903 is about 517.4578873057.

The spelling of 138555903 in words is "one hundred thirty-eight million, five hundred fifty-five thousand, nine hundred three".