138655361 has 8 divisors (see below), whose sum is σ = 151550784. Its totient is φ = 126078480.

The previous prime is 138655357. The next prime is 138655373. The reversal of 138655361 is 163556831.

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 138655361 - 2² = 138655357 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138655861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78725 + ... + 80466.

It is an arithmetic number, because the mean of its divisors is an integer number (18943848).

Almost surely, 2^138655361 is an apocalyptic number.

It is an amenable number.

138655361 is a deficient number, since it is larger than the sum of its proper divisors (12895423).

138655361 is a wasteful number, since it uses less digits than its factorization.

138655361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159271.

The product of its digits is 64800, while the sum is 38.

The square root of 138655361 is about 11775.2011023167. The cubic root of 138655361 is about 517.5816713189.

The spelling of 138655361 in words is "one hundred thirty-eight million, six hundred fifty-five thousand, three hundred sixty-one".