138509149723 has 8 divisors (see below), whose sum is σ = 158765895392. Its totient is φ = 118369835136.

The previous prime is 138509149703. The next prime is 138509149729. The reversal of 138509149723 is 327941905831.

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

It is not a de Polignac number, because 138509149723 - 2²⁹ = 137972278811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138509149729) 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, 29355240 + ... + 29359957.

It is an arithmetic number, because the mean of its divisors is an integer number (19845736924).

Almost surely, 2^138509149723 is an apocalyptic number.

138509149723 is a deficient number, since it is larger than the sum of its proper divisors (20256745669).

138509149723 is an equidigital number, since it uses as much as digits as its factorization.

138509149723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58715541.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 138509149723 in words is "one hundred thirty-eight billion, five hundred nine million, one hundred forty-nine thousand, seven hundred twenty-three".