138579841 has 4 divisors (see below), whose sum is σ = 141802672. Its totient is φ = 135357012.

The previous prime is 138579823. The next prime is 138579851. The reversal of 138579841 is 148975831.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 138579841 - 2¹¹ = 138577793 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138579791 and 138579800.

It is not an unprimeable number, because it can be changed into a prime (138579851) 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, 1611351 + ... + 1611436.

It is an arithmetic number, because the mean of its divisors is an integer number (35450668).

Almost surely, 2^138579841 is an apocalyptic number.

It is an amenable number.

138579841 is a deficient number, since it is larger than the sum of its proper divisors (3222831).

138579841 is an equidigital number, since it uses as much as digits as its factorization.

138579841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3222830.

The product of its digits is 241920, while the sum is 46.

The square root of 138579841 is about 11771.9939262641. The cubic root of 138579841 is about 517.4876856117.

The spelling of 138579841 in words is "one hundred thirty-eight million, five hundred seventy-nine thousand, eight hundred forty-one".