138324621784 has 16 divisors (see below), whose sum is σ = 259608304800. Its totient is φ = 69095740512.

The previous prime is 138324621781. The next prime is 138324621791. The reversal of 138324621784 is 487126423831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138324621781) 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, 8312467 + ... + 8329090.

It is an arithmetic number, because the mean of its divisors is an integer number (16225519050).

Almost surely, 2^138324621784 is an apocalyptic number.

It is an amenable number.

138324621784 is a deficient number, since it is larger than the sum of its proper divisors (121283683016).

138324621784 is a wasteful number, since it uses less digits than its factorization.

138324621784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16642602 (or 16642598 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 49.

The spelling of 138324621784 in words is "one hundred thirty-eight billion, three hundred twenty-four million, six hundred twenty-one thousand, seven hundred eighty-four".