138647255 has 4 divisors (see below), whose sum is σ = 166376712. Its totient is φ = 110917800.

The previous prime is 138647239. The next prime is 138647263. The reversal of 138647255 is 552746831.

138647255 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 138647255 - 2⁴ = 138647239 is a prime.

It is a super-2 number, since 2×138647255² = 38446122638070050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13864721 + ... + 13864730.

It is an arithmetic number, because the mean of its divisors is an integer number (41594178).

Almost surely, 2^138647255 is an apocalyptic number.

138647255 is a deficient number, since it is larger than the sum of its proper divisors (27729457).

138647255 is an equidigital number, since it uses as much as digits as its factorization.

138647255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27729456.

The product of its digits is 201600, while the sum is 41.

The square root of 138647255 is about 11774.8568993428. The cubic root of 138647255 is about 517.5715849226.

The spelling of 138647255 in words is "one hundred thirty-eight million, six hundred forty-seven thousand, two hundred fifty-five".