138343771 has 4 divisors (see below), whose sum is σ = 141561112. Its totient is φ = 135126432.

The previous prime is 138343763. The next prime is 138343787. The reversal of 138343771 is 177343831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138343771 - 2³ = 138343763 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 138343771.

It is not an unprimeable number, because it can be changed into a prime (138343721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1608606 + ... + 1608691.

It is an arithmetic number, because the mean of its divisors is an integer number (35390278).

Almost surely, 2^138343771 is an apocalyptic number.

138343771 is a deficient number, since it is larger than the sum of its proper divisors (3217341).

138343771 is an equidigital number, since it uses as much as digits as its factorization.

138343771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3217340.

The product of its digits is 42336, while the sum is 37.

The square root of 138343771 is about 11761.9628889059. The cubic root of 138343771 is about 517.1936727862.

It can be divided in two parts, 1383 and 43771, that added together give a palindrome (45154).

The spelling of 138343771 in words is "one hundred thirty-eight million, three hundred forty-three thousand, seven hundred seventy-one".