138028263 has 8 divisors (see below), whose sum is σ = 188526576. Its totient is φ = 89774400.

The previous prime is 138028259. The next prime is 138028273. The reversal of 138028263 is 362820831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138028263 - 2² = 138028259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138028273) 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 7 ways as a sum of consecutive naturals, for example, 560968 + ... + 561213.

It is an arithmetic number, because the mean of its divisors is an integer number (23565822).

Almost surely, 2^138028263 is an apocalyptic number.

138028263 is a deficient number, since it is larger than the sum of its proper divisors (50498313).

138028263 is a wasteful number, since it uses less digits than its factorization.

138028263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122225.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 138028263 is about 11748.5430160510. The cubic root of 138028263 is about 516.8002013961.

The spelling of 138028263 in words is "one hundred thirty-eight million, twenty-eight thousand, two hundred sixty-three".