138538763 has 8 divisors (see below), whose sum is σ = 160023600. Its totient is φ = 118535680.

The previous prime is 138538759. The next prime is 138538789. The reversal of 138538763 is 367835831.

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

It is a cyclic number.

It is not a de Polignac number, because 138538763 - 2² = 138538759 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138538793) 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, 370238 + ... + 370611.

It is an arithmetic number, because the mean of its divisors is an integer number (20002950).

Almost surely, 2^138538763 is an apocalyptic number.

138538763 is a deficient number, since it is larger than the sum of its proper divisors (21484837).

138538763 is a wasteful number, since it uses less digits than its factorization.

138538763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740877.

The product of its digits is 362880, while the sum is 44.

The square root of 138538763 is about 11770.2490627854. The cubic root of 138538763 is about 517.4365491219.

The spelling of 138538763 in words is "one hundred thirty-eight million, five hundred thirty-eight thousand, seven hundred sixty-three".