138320494989 has 8 divisors (see below), whose sum is σ = 190786889760. Its totient is φ = 89033881776.

The previous prime is 138320494967. The next prime is 138320494993. The reversal of 138320494989 is 989494023831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138320494989 - 2⁵ = 138320494957 is a prime.

It is a super-2 number, since 2×138320494989² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138320494889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 794945287 + ... + 794945460.

It is an arithmetic number, because the mean of its divisors is an integer number (23848361220).

Almost surely, 2^138320494989 is an apocalyptic number.

It is an amenable number.

138320494989 is a deficient number, since it is larger than the sum of its proper divisors (52466394771).

138320494989 is a wasteful number, since it uses less digits than its factorization.

138320494989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1589890779.

The product of its (nonzero) digits is 13436928, while the sum is 60.

The spelling of 138320494989 in words is "one hundred thirty-eight billion, three hundred twenty million, four hundred ninety-four thousand, nine hundred eighty-nine".