138635837 has 8 divisors (see below), whose sum is σ = 147351360. Its totient is φ = 130062240.

The previous prime is 138635803. The next prime is 138635839. The reversal of 138635837 is 738536831.

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 138635837 - 2¹⁶ = 138570301 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 (138635839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33464 + ... + 37377.

It is an arithmetic number, because the mean of its divisors is an integer number (18418920).

Almost surely, 2^138635837 is an apocalyptic number.

It is an amenable number.

138635837 is a deficient number, since it is larger than the sum of its proper divisors (8715523).

138635837 is a wasteful number, since it uses less digits than its factorization.

138635837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70963.

The product of its digits is 362880, while the sum is 44.

The square root of 138635837 is about 11774.3720427036. The cubic root of 138635837 is about 517.5573766966.

The spelling of 138635837 in words is "one hundred thirty-eight million, six hundred thirty-five thousand, eight hundred thirty-seven".