138503243 has 2 divisors, whose sum is σ = 138503244. Its totient is φ = 138503242.

The previous prime is 138503221. The next prime is 138503251. The reversal of 138503243 is 342305831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138503243 - 2¹⁰ = 138502219 is a prime.

It is not a weakly prime, because it can be changed into another prime (138503203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69251621 + 69251622.

It is an arithmetic number, because the mean of its divisors is an integer number (69251622).

Almost surely, 2^138503243 is an apocalyptic number.

138503243 is a deficient number, since it is larger than the sum of its proper divisors (1).

138503243 is an equidigital number, since it uses as much as digits as its factorization.

138503243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 138503243 is about 11768.7400770006. The cubic root of 138503243 is about 517.3923234318.

The spelling of 138503243 in words is "one hundred thirty-eight million, five hundred three thousand, two hundred forty-three".