138543773 has 4 divisors (see below), whose sum is σ = 138575580. Its totient is φ = 138511968.

The previous prime is 138543767. The next prime is 138543787. The reversal of 138543773 is 377345831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 377345831 = 3271 ⋅115361.

It can be written as a sum of positive squares in 2 ways, for example, as 131377444 + 7166329 = 11462^2 + 2677^2 .

It is a cyclic number.

It is not a de Polignac number, because 138543773 - 2⁶ = 138543709 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 138543773.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138543703) 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, 8090 + ... + 18507.

It is an arithmetic number, because the mean of its divisors is an integer number (34643895).

Almost surely, 2^138543773 is an apocalyptic number.

It is an amenable number.

138543773 is a deficient number, since it is larger than the sum of its proper divisors (31807).

138543773 is an equidigital number, since it uses as much as digits as its factorization.

138543773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31806.

The product of its digits is 211680, while the sum is 41.

The square root of 138543773 is about 11770.4618855846. The cubic root of 138543773 is about 517.4427864277.

The spelling of 138543773 in words is "one hundred thirty-eight million, five hundred forty-three thousand, seven hundred seventy-three".