138387073 has 4 divisors (see below), whose sum is σ = 150967728. Its totient is φ = 125806420.

The previous prime is 138387071. The next prime is 138387077. The reversal of 138387073 is 370783831.

138387073 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 370783831 = 11 ⋅33707621.

It is a cyclic number.

It is not a de Polignac number, because 138387073 - 2¹ = 138387071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138387071) 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, 6290311 + ... + 6290332.

It is an arithmetic number, because the mean of its divisors is an integer number (37741932).

Almost surely, 2^138387073 is an apocalyptic number.

It is an amenable number.

138387073 is a deficient number, since it is larger than the sum of its proper divisors (12580655).

138387073 is a wasteful number, since it uses less digits than its factorization.

138387073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12580654.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 138387073 is about 11763.8035090697. The cubic root of 138387073 is about 517.2476281951.

The spelling of 138387073 in words is "one hundred thirty-eight million, three hundred eighty-seven thousand, seventy-three".