138583579 has 4 divisors (see below), whose sum is σ = 144608976. Its totient is φ = 132558184.

The previous prime is 138583561. The next prime is 138583603. The reversal of 138583579 is 975385831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 975385831 = 7 ⋅139340833.

It is a cyclic number.

It is not a de Polignac number, because 138583579 - 2¹³ = 138575387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138583519) 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, 3012664 + ... + 3012709.

It is an arithmetic number, because the mean of its divisors is an integer number (36152244).

Almost surely, 2^138583579 is an apocalyptic number.

138583579 is a deficient number, since it is larger than the sum of its proper divisors (6025397).

138583579 is an equidigital number, since it uses as much as digits as its factorization.

138583579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6025396.

The product of its digits is 907200, while the sum is 49.

The square root of 138583579 is about 11772.1526918402. The cubic root of 138583579 is about 517.4923384087.

The spelling of 138583579 in words is "one hundred thirty-eight million, five hundred eighty-three thousand, five hundred seventy-nine".