138366755 has 8 divisors (see below), whose sum is σ = 168315072. Its totient is φ = 109176768.

The previous prime is 138366751. The next prime is 138366779. The reversal of 138366755 is 557663831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138366755 - 2² = 138366751 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138366751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189179 + ... + 189908.

It is an arithmetic number, because the mean of its divisors is an integer number (21039384).

Almost surely, 2^138366755 is an apocalyptic number.

138366755 is a deficient number, since it is larger than the sum of its proper divisors (29948317).

138366755 is an equidigital number, since it uses as much as digits as its factorization.

138366755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379165.

The product of its digits is 453600, while the sum is 44.

The square root of 138366755 is about 11762.9398961314. The cubic root of 138366755 is about 517.2223128448. Note that the first 3 decimals are identical.

The spelling of 138366755 in words is "one hundred thirty-eight million, three hundred sixty-six thousand, seven hundred fifty-five".