138605997 has 8 divisors (see below), whose sum is σ = 185511744. Its totient is φ = 92052128.

The previous prime is 138605989. The next prime is 138606001. The reversal of 138605997 is 799506831.

138605997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 138605997 - 2³ = 138605989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138605197) 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, 87048 + ... + 88625.

It is an arithmetic number, because the mean of its divisors is an integer number (23188968).

Almost surely, 2^138605997 is an apocalyptic number.

It is an amenable number.

138605997 is a deficient number, since it is larger than the sum of its proper divisors (46905747).

138605997 is a wasteful number, since it uses less digits than its factorization.

138605997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175939.

The product of its (nonzero) digits is 408240, while the sum is 48.

The square root of 138605997 is about 11773.1048156381. The cubic root of 138605997 is about 517.5202409876.

The spelling of 138605997 in words is "one hundred thirty-eight million, six hundred five thousand, nine hundred ninety-seven".