138908927 has 4 divisors (see below), whose sum is σ = 143698920. Its totient is φ = 134118936.

The previous prime is 138908911. The next prime is 138908933. The reversal of 138908927 is 729809831.

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

It is a cyclic number.

It is not a de Polignac number, because 138908927 - 2⁴ = 138908911 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 (138908227) 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, 2394953 + ... + 2395010.

It is an arithmetic number, because the mean of its divisors is an integer number (35924730).

Almost surely, 2^138908927 is an apocalyptic number.

138908927 is a deficient number, since it is larger than the sum of its proper divisors (4789993).

138908927 is an equidigital number, since it uses as much as digits as its factorization.

138908927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4789992.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 138908927 is about 11785.9631341694. The cubic root of 138908927 is about 517.8969883561.

The spelling of 138908927 in words is "one hundred thirty-eight million, nine hundred eight thousand, nine hundred twenty-seven".