138776755 has 8 divisors (see below), whose sum is σ = 179342352. Its totient is φ = 102481248.

The previous prime is 138776749. The next prime is 138776767. The reversal of 138776755 is 557677831.

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 138776755 - 2²¹ = 136679603 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138776699 and 138776708.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1067449 + ... + 1067578.

It is an arithmetic number, because the mean of its divisors is an integer number (22417794).

Almost surely, 2^138776755 is an apocalyptic number.

138776755 is a deficient number, since it is larger than the sum of its proper divisors (40565597).

138776755 is a wasteful number, since it uses less digits than its factorization.

138776755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135045.

The product of its digits is 1234800, while the sum is 49.

The square root of 138776755 is about 11780.3546211479. The cubic root of 138776755 is about 517.7326763754.

The spelling of 138776755 in words is "one hundred thirty-eight million, seven hundred seventy-six thousand, seven hundred fifty-five".