138766255 has 4 divisors (see below), whose sum is σ = 166519512. Its totient is φ = 111013000.

The previous prime is 138766249. The next prime is 138766259. The reversal of 138766255 is 552667831.

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

It is not a de Polignac number, because 138766255 - 2⁷ = 138766127 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 (138766259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13876621 + ... + 13876630.

It is an arithmetic number, because the mean of its divisors is an integer number (41629878).

Almost surely, 2^138766255 is an apocalyptic number.

138766255 is a deficient number, since it is larger than the sum of its proper divisors (27753257).

138766255 is an equidigital number, since it uses as much as digits as its factorization.

138766255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27753256.

The product of its digits is 302400, while the sum is 43.

The square root of 138766255 is about 11779.9089555056. The cubic root of 138766255 is about 517.7196186406.

The spelling of 138766255 in words is "one hundred thirty-eight million, seven hundred sixty-six thousand, two hundred fifty-five".