138606738 has 8 divisors (see below), whose sum is σ = 277213488. Its totient is φ = 46202244.

The previous prime is 138606737. The next prime is 138606739. The reversal of 138606738 is 837606831.

It is an interprime number because it is at equal distance from previous prime (138606737) and next prime (138606739).

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

138606738 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 138606738.

It is not an unprimeable number, because it can be changed into a prime (138606737) 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 3 ways as a sum of consecutive naturals, for example, 11550556 + ... + 11550567.

It is an arithmetic number, because the mean of its divisors is an integer number (34651686).

Almost surely, 2^138606738 is an apocalyptic number.

138606738 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138606738 is a wasteful number, since it uses less digits than its factorization.

138606738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23101128.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 138606738 is about 11773.1362856292. The cubic root of 138606738 is about 517.5211632224.

The spelling of 138606738 in words is "one hundred thirty-eight million, six hundred six thousand, seven hundred thirty-eight".