138391444949 has 8 divisors (see below), whose sum is σ = 141473917440. Its totient is φ = 135333534400.

The previous prime is 138391444913. The next prime is 138391444973. The reversal of 138391444949 is 949444193831.

It is a happy number.

138391444949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 138391444949 - 2¹² = 138391440853 is a prime.

It is a super-2 number, since 2×138391444949² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138391441949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6129092 + ... + 6151629.

It is an arithmetic number, because the mean of its divisors is an integer number (17684239680).

Almost surely, 2^138391444949 is an apocalyptic number.

It is an amenable number.

138391444949 is a deficient number, since it is larger than the sum of its proper divisors (3082472491).

138391444949 is a wasteful number, since it uses less digits than its factorization.

138391444949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12280971.

The product of its digits is 13436928, while the sum is 59.

The spelling of 138391444949 in words is "one hundred thirty-eight billion, three hundred ninety-one million, four hundred forty-four thousand, nine hundred forty-nine".