138694255 has 48 divisors (see below), whose sum is σ = 204609024. Its totient is φ = 89812800.

The previous prime is 138694253. The next prime is 138694261. The reversal of 138694255 is 552496831.

It is not a de Polignac number, because 138694255 - 2¹ = 138694253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138694253) 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 47 ways as a sum of consecutive naturals, for example, 850804 + ... + 850966.

It is an arithmetic number, because the mean of its divisors is an integer number (4262688).

Almost surely, 2^138694255 is an apocalyptic number.

138694255 is a deficient number, since it is larger than the sum of its proper divisors (65914769).

138694255 is a wasteful number, since it uses less digits than its factorization.

138694255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356 (or 349 counting only the distinct ones).

The product of its digits is 259200, while the sum is 43.

The square root of 138694255 is about 11776.8525082044. The cubic root of 138694255 is about 517.6300621382.

The spelling of 138694255 in words is "one hundred thirty-eight million, six hundred ninety-four thousand, two hundred fifty-five".