138447255 has 16 divisors (see below), whose sum is σ = 222077664. Its totient is φ = 73651200.

The previous prime is 138447251. The next prime is 138447293. The reversal of 138447255 is 552744831.

It is not a de Polignac number, because 138447255 - 2² = 138447251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138447251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5494 + ... + 17523.

It is an arithmetic number, because the mean of its divisors is an integer number (13879854).

Almost surely, 2^138447255 is an apocalyptic number.

138447255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138447255 is a deficient number, since it is larger than the sum of its proper divisors (83630409).

138447255 is a wasteful number, since it uses less digits than its factorization.

138447255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23426.

The product of its digits is 134400, while the sum is 39.

The square root of 138447255 is about 11766.3611622285. The cubic root of 138447255 is about 517.3225978309.

The spelling of 138447255 in words is "one hundred thirty-eight million, four hundred forty-seven thousand, two hundred fifty-five".