138340440023 has 8 divisors (see below), whose sum is σ = 138578875680. Its totient is φ = 138102176160.

The previous prime is 138340440019. The next prime is 138340440061. The reversal of 138340440023 is 320044043831.

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 138340440023 - 2² = 138340440019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138340440013) 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, 1624286 + ... + 1707332.

It is an arithmetic number, because the mean of its divisors is an integer number (17322359460).

Almost surely, 2^138340440023 is an apocalyptic number.

138340440023 is a deficient number, since it is larger than the sum of its proper divisors (238435657).

138340440023 is an equidigital number, since it uses as much as digits as its factorization.

138340440023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85897.

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 138340440023 its reverse (320044043831), we get a palindrome (458384483854).

The spelling of 138340440023 in words is "one hundred thirty-eight billion, three hundred forty million, four hundred forty thousand, twenty-three".