138839055 has 16 divisors (see below), whose sum is σ = 223200384. Its totient is φ = 73694880.

The previous prime is 138839047. The next prime is 138839087. The reversal of 138839055 is 550938831.

It is not a de Polignac number, because 138839055 - 2³ = 138839047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138838998 and 138839016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18769 + ... + 25098.

It is an arithmetic number, because the mean of its divisors is an integer number (13950024).

Almost surely, 2^138839055 is an apocalyptic number.

138839055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138839055 is a deficient number, since it is larger than the sum of its proper divisors (84361329).

138839055 is a wasteful number, since it uses less digits than its factorization.

138839055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44086.

The product of its (nonzero) digits is 129600, while the sum is 42.

The square root of 138839055 is about 11782.9985572434. The cubic root of 138839055 is about 517.8101387245.

The spelling of 138839055 in words is "one hundred thirty-eight million, eight hundred thirty-nine thousand, fifty-five".