138647849 has 8 divisors (see below), whose sum is σ = 140434560. Its totient is φ = 136866400.

The previous prime is 138647833. The next prime is 138647879. The reversal of 138647849 is 948746831.

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 138647849 - 2⁴ = 138647833 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 138647797 and 138647806.

It is not an unprimeable number, because it can be changed into a prime (138647809) 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, 91004 + ... + 92514.

It is an arithmetic number, because the mean of its divisors is an integer number (17554320).

Almost surely, 2^138647849 is an apocalyptic number.

It is an amenable number.

138647849 is a deficient number, since it is larger than the sum of its proper divisors (1786711).

138647849 is a wasteful number, since it uses less digits than its factorization.

138647849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2631.

The product of its digits is 1161216, while the sum is 50.

The square root of 138647849 is about 11774.8821225522. The cubic root of 138647849 is about 517.5723240575.

The spelling of 138647849 in words is "one hundred thirty-eight million, six hundred forty-seven thousand, eight hundred forty-nine".