138539355 has 16 divisors (see below), whose sum is σ = 233329920. Its totient is φ = 69998688.

The previous prime is 138539311. The next prime is 138539381. The reversal of 138539355 is 553935831.

It is not a de Polignac number, because 138539355 - 2⁷ = 138539227 is a prime.

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, 242767 + ... + 243336.

It is an arithmetic number, because the mean of its divisors is an integer number (14583120).

Almost surely, 2^138539355 is an apocalyptic number.

138539355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138539355 is a deficient number, since it is larger than the sum of its proper divisors (94790565).

138539355 is a wasteful number, since it uses less digits than its factorization.

138539355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486130.

The product of its digits is 243000, while the sum is 42.

The square root of 138539355 is about 11770.2742109094. The cubic root of 138539355 is about 517.4372861527.

The spelling of 138539355 in words is "one hundred thirty-eight million, five hundred thirty-nine thousand, three hundred fifty-five".