138385749 has 4 divisors (see below), whose sum is σ = 184514336. Its totient is φ = 92257164.

The previous prime is 138385747. The next prime is 138385771. The reversal of 138385749 is 947583831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 138385749 - 2¹ = 138385747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138385698 and 138385707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138385747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23064289 + ... + 23064294.

It is an arithmetic number, because the mean of its divisors is an integer number (46128584).

Almost surely, 2^138385749 is an apocalyptic number.

It is an amenable number.

138385749 is a deficient number, since it is larger than the sum of its proper divisors (46128587).

138385749 is an equidigital number, since it uses as much as digits as its factorization.

138385749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46128586.

The product of its digits is 725760, while the sum is 48.

The square root of 138385749 is about 11763.7472346187. The cubic root of 138385749 is about 517.2459786238.

The spelling of 138385749 in words is "one hundred thirty-eight million, three hundred eighty-five thousand, seven hundred forty-nine".