138862435609 has 4 divisors (see below), whose sum is σ = 138910671360. Its totient is φ = 138814199860.

The previous prime is 138862435603. The next prime is 138862435633. The reversal of 138862435609 is 906534268831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 906534268831 = 77191 ⋅11744041.

It is a cyclic number.

It is not a de Polignac number, because 138862435609 - 2³ = 138862435601 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138862435609.

It is not an unprimeable number, because it can be changed into a prime (138862435601) 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, 24113557 + ... + 24119314.

It is an arithmetic number, because the mean of its divisors is an integer number (34727667840).

Almost surely, 2^138862435609 is an apocalyptic number.

It is an amenable number.

138862435609 is a deficient number, since it is larger than the sum of its proper divisors (48235751).

138862435609 is an equidigital number, since it uses as much as digits as its factorization.

138862435609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48235750.

The product of its (nonzero) digits is 7464960, while the sum is 55.

The spelling of 138862435609 in words is "one hundred thirty-eight billion, eight hundred sixty-two million, four hundred thirty-five thousand, six hundred nine".