138206203 has 4 divisors (see below), whose sum is σ = 141577128. Its totient is φ = 134835280.

The previous prime is 138206183. The next prime is 138206213. The reversal of 138206203 is 302602831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 302602831 = 167 ⋅1811993.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138206203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138206213) 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, 1685401 + ... + 1685482.

It is an arithmetic number, because the mean of its divisors is an integer number (35394282).

Almost surely, 2^138206203 is an apocalyptic number.

138206203 is a deficient number, since it is larger than the sum of its proper divisors (3370925).

138206203 is an equidigital number, since it uses as much as digits as its factorization.

138206203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3370924.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 138206203 is about 11756.1134308920. The cubic root of 138206203 is about 517.0221847721.

The spelling of 138206203 in words is "one hundred thirty-eight million, two hundred six thousand, two hundred three".