138634647 has 8 divisors (see below), whose sum is σ = 184995840. Its totient is φ = 92348280.

The previous prime is 138634627. The next prime is 138634649. The reversal of 138634647 is 746436831.

It is a happy number.

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

It is not a de Polignac number, because 138634647 - 2¹² = 138630551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138634599 and 138634608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138634649) 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, 14229 + ... + 21902.

It is an arithmetic number, because the mean of its divisors is an integer number (23124480).

Almost surely, 2^138634647 is an apocalyptic number.

138634647 is a deficient number, since it is larger than the sum of its proper divisors (46361193).

138634647 is a wasteful number, since it uses less digits than its factorization.

138634647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37413.

The product of its digits is 290304, while the sum is 42.

The square root of 138634647 is about 11774.3215091147. The cubic root of 138634647 is about 517.5558958504. Note that the first 3 decimals are identical.

The spelling of 138634647 in words is "one hundred thirty-eight million, six hundred thirty-four thousand, six hundred forty-seven".