138244439385 has 96 divisors (see below), whose sum is σ = 263906942208. Its totient is φ = 66529589760.

The previous prime is 138244439353. The next prime is 138244439387. The reversal of 138244439385 is 583934442831.

138244439385 is a `hidden beast` number, since 1 + 3 + 8 + 244 + 4 + 393 + 8 + 5 = 666.

It is not a de Polignac number, because 138244439385 - 2⁵ = 138244439353 is a prime.

It is a super-2 number, since 2×138244439385² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (138244439387) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5804772 + ... + 5828538.

It is an arithmetic number, because the mean of its divisors is an integer number (2749030648).

Almost surely, 2^138244439385 is an apocalyptic number.

138244439385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138244439385 is a deficient number, since it is larger than the sum of its proper divisors (125662502823).

138244439385 is a wasteful number, since it uses less digits than its factorization.

138244439385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24015 (or 24012 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 54.

The spelling of 138244439385 in words is "one hundred thirty-eight billion, two hundred forty-four million, four hundred thirty-nine thousand, three hundred eighty-five".