138815593 has 4 divisors (see below), whose sum is σ = 158646400. Its totient is φ = 118984788.

The previous prime is 138815569. The next prime is 138815629. The reversal of 138815593 is 395518831.

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: 395518831 = 59 ⋅6703709.

It is a cyclic number.

It is not a de Polignac number, because 138815593 - 2¹³ = 138807401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138815513) 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, 9915393 + ... + 9915406.

It is an arithmetic number, because the mean of its divisors is an integer number (39661600).

Almost surely, 2^138815593 is an apocalyptic number.

It is an amenable number.

138815593 is a deficient number, since it is larger than the sum of its proper divisors (19830807).

138815593 is an equidigital number, since it uses as much as digits as its factorization.

138815593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19830806.

The product of its digits is 129600, while the sum is 43.

The square root of 138815593 is about 11782.0029281952. The cubic root of 138815593 is about 517.7809693483.

The spelling of 138815593 in words is "one hundred thirty-eight million, eight hundred fifteen thousand, five hundred ninety-three".