138572579 has 4 divisors (see below), whose sum is σ = 141952440. Its totient is φ = 135192720.

The previous prime is 138572569. The next prime is 138572611. The reversal of 138572579 is 975275831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 975275831 = 23 ⋅42403297.

It is a cyclic number.

It is not a de Polignac number, because 138572579 - 2⁴ = 138572563 is a prime.

It is a super-2 number, since 2×138572579² = 38404719301422482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138572509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1689869 + ... + 1689950.

It is an arithmetic number, because the mean of its divisors is an integer number (35488110).

Almost surely, 2^138572579 is an apocalyptic number.

138572579 is a deficient number, since it is larger than the sum of its proper divisors (3379861).

138572579 is an equidigital number, since it uses as much as digits as its factorization.

138572579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3379860.

The product of its digits is 529200, while the sum is 47.

The square root of 138572579 is about 11771.6854782992. The cubic root of 138572579 is about 517.4786461507.

The spelling of 138572579 in words is "one hundred thirty-eight million, five hundred seventy-two thousand, five hundred seventy-nine".