138389617 has 4 divisors (see below), whose sum is σ = 138928356. Its totient is φ = 137850880.

The previous prime is 138389599. The next prime is 138389659. The reversal of 138389617 is 716983831.

138389617 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 716983831 = 7019 ⋅102149.

It can be written as a sum of positive squares in 2 ways, for example, as 97634161 + 40755456 = 9881^2 + 6384^2 .

It is a cyclic number.

It is not a de Polignac number, because 138389617 - 2¹⁵ = 138356849 is a prime.

It is a super-3 number, since 3×138389617³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138389687) 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, 268984 + ... + 269497.

It is an arithmetic number, because the mean of its divisors is an integer number (34732089).

Almost surely, 2^138389617 is an apocalyptic number.

It is an amenable number.

138389617 is a deficient number, since it is larger than the sum of its proper divisors (538739).

138389617 is an equidigital number, since it uses as much as digits as its factorization.

138389617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538738.

The product of its digits is 217728, while the sum is 46.

The square root of 138389617 is about 11763.9116368664. The cubic root of 138389617 is about 517.2507977347.

The spelling of 138389617 in words is "one hundred thirty-eight million, three hundred eighty-nine thousand, six hundred seventeen".