138758443 has 4 divisors (see below), whose sum is σ = 138804280. Its totient is φ = 138712608.

The previous prime is 138758423. The next prime is 138758447. The reversal of 138758443 is 344857831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 344857831 = 79 ⋅4365289.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138758443 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 138758443.

It is not an unprimeable number, because it can be changed into a prime (138758447) 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, 18030 + ... + 24547.

It is an arithmetic number, because the mean of its divisors is an integer number (34701070).

Almost surely, 2^138758443 is an apocalyptic number.

138758443 is a deficient number, since it is larger than the sum of its proper divisors (45837).

138758443 is an equidigital number, since it uses as much as digits as its factorization.

138758443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45836.

The product of its digits is 322560, while the sum is 43.

The square root of 138758443 is about 11779.5773693287. The cubic root of 138758443 is about 517.7099032585.

The spelling of 138758443 in words is "one hundred thirty-eight million, seven hundred fifty-eight thousand, four hundred forty-three".