138523263 has 4 divisors (see below), whose sum is σ = 184697688. Its totient is φ = 92348840.

The previous prime is 138523223. The next prime is 138523279. The reversal of 138523263 is 362325831.

138523263 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 138523263 - 2⁹ = 138522751 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138523223) 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, 23087208 + ... + 23087213.

It is an arithmetic number, because the mean of its divisors is an integer number (46174422).

Almost surely, 2^138523263 is an apocalyptic number.

138523263 is a deficient number, since it is larger than the sum of its proper divisors (46174425).

138523263 is an equidigital number, since it uses as much as digits as its factorization.

138523263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46174424.

The product of its digits is 25920, while the sum is 33.

The square root of 138523263 is about 11769.5906046047. The cubic root of 138523263 is about 517.4172511159.

The spelling of 138523263 in words is "one hundred thirty-eight million, five hundred twenty-three thousand, two hundred sixty-three".