138203996406 has 64 divisors (see below), whose sum is σ = 318608294400. Its totient is φ = 39149130240.

The previous prime is 138203996401. The next prime is 138203996429. The reversal of 138203996406 is 604699302831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138203996401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2267620 + ... + 2327768.

It is an arithmetic number, because the mean of its divisors is an integer number (4978254600).

Almost surely, 2^138203996406 is an apocalyptic number.

138203996406 is an abundant number, since it is smaller than the sum of its proper divisors (180404297994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138203996406 is a wasteful number, since it uses less digits than its factorization.

138203996406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60629.

The product of its (nonzero) digits is 1679616, while the sum is 51.

The spelling of 138203996406 in words is "one hundred thirty-eight billion, two hundred three million, nine hundred ninety-six thousand, four hundred six".