138185843 has 4 divisors (see below), whose sum is σ = 146314440. Its totient is φ = 130057248.

The previous prime is 138185837. The next prime is 138185849. The reversal of 138185843 is 348581831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 348581831 = 13 ⋅26813987.

It is an interprime number because it is at equal distance from previous prime (138185837) and next prime (138185849).

It is a cyclic number.

It is not a de Polignac number, because 138185843 - 2¹⁴ = 138169459 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138185843.

It is not an unprimeable number, because it can be changed into a prime (138185849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4064273 + ... + 4064306.

It is an arithmetic number, because the mean of its divisors is an integer number (36578610).

Almost surely, 2^138185843 is an apocalyptic number.

138185843 is a deficient number, since it is larger than the sum of its proper divisors (8128597).

138185843 is an equidigital number, since it uses as much as digits as its factorization.

138185843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8128596.

The product of its digits is 92160, while the sum is 41.

The square root of 138185843 is about 11755.2474665572. The cubic root of 138185843 is about 516.9967949598.

The spelling of 138185843 in words is "one hundred thirty-eight million, one hundred eighty-five thousand, eight hundred forty-three".