138846021489 has 96 divisors (see below), whose sum is σ = 252911812608. Its totient is φ = 71650656000.

The previous prime is 138846021487. The next prime is 138846021491. The reversal of 138846021489 is 984120648831.

It is a happy number.

138846021489 is a `hidden beast` number, since 1 + 3 + 8 + 84 + 60 + 21 + 489 = 666.

138846021489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (138846021487) and next prime (138846021491).

It is not a de Polignac number, because 138846021489 - 2¹ = 138846021487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138846021481) 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 95 ways as a sum of consecutive naturals, for example, 1803984 + ... + 1879374.

It is an arithmetic number, because the mean of its divisors is an integer number (2634498048).

Almost surely, 2^138846021489 is an apocalyptic number.

It is an amenable number.

138846021489 is a deficient number, since it is larger than the sum of its proper divisors (114065791119).

138846021489 is a wasteful number, since it uses less digits than its factorization.

138846021489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75499 (or 75496 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 54.

The spelling of 138846021489 in words is "one hundred thirty-eight billion, eight hundred forty-six million, twenty-one thousand, four hundred eighty-nine".