138533903 has 4 divisors (see below), whose sum is σ = 138571800. Its totient is φ = 138496008.

The previous prime is 138533881. The next prime is 138533909. The reversal of 138533903 is 309335831.

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 138533903 - 2¹⁶ = 138468367 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 (138533909) 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, 12800 + ... + 20997.

It is an arithmetic number, because the mean of its divisors is an integer number (34642950).

Almost surely, 2^138533903 is an apocalyptic number.

138533903 is a deficient number, since it is larger than the sum of its proper divisors (37897).

138533903 is an equidigital number, since it uses as much as digits as its factorization.

138533903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37896.

The product of its (nonzero) digits is 29160, while the sum is 35.

The square root of 138533903 is about 11770.0426082491. The cubic root of 138533903 is about 517.4304984182.

The spelling of 138533903 in words is "one hundred thirty-eight million, five hundred thirty-three thousand, nine hundred three".