138900243 has 16 divisors (see below), whose sum is σ = 199489536. Its totient is φ = 85715520.

The previous prime is 138900221. The next prime is 138900247. The reversal of 138900243 is 342009831.

It is not a de Polignac number, because 138900243 - 2⁹ = 138899731 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138900243.

It is not an unprimeable number, because it can be changed into a prime (138900247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30330 + ... + 34607.

It is an arithmetic number, because the mean of its divisors is an integer number (12468096).

Almost surely, 2^138900243 is an apocalyptic number.

138900243 is a deficient number, since it is larger than the sum of its proper divisors (60589293).

138900243 is a wasteful number, since it uses less digits than its factorization.

138900243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64994.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 138900243 is about 11785.5947240689. The cubic root of 138900243 is about 517.8861958864.

The spelling of 138900243 in words is "one hundred thirty-eight million, nine hundred thousand, two hundred forty-three".