138776955 has 16 divisors (see below), whose sum is σ = 225172224. Its totient is φ = 72971360.

The previous prime is 138776941. The next prime is 138776993. The reversal of 138776955 is 559677831.

It is not a de Polignac number, because 138776955 - 2⁸ = 138776699 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138776898 and 138776907.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 64089 + ... + 66218.

It is an arithmetic number, because the mean of its divisors is an integer number (14073264).

Almost surely, 2^138776955 is an apocalyptic number.

138776955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138776955 is a deficient number, since it is larger than the sum of its proper divisors (86395269).

138776955 is a wasteful number, since it uses less digits than its factorization.

138776955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130386.

The product of its digits is 1587600, while the sum is 51.

The square root of 138776955 is about 11780.3631098536. The cubic root of 138776955 is about 517.7329250878.

The spelling of 138776955 in words is "one hundred thirty-eight million, seven hundred seventy-six thousand, nine hundred fifty-five".