138443593 has 8 divisors (see below), whose sum is σ = 146711880. Its totient is φ = 130408320.

The previous prime is 138443567. The next prime is 138443609. The reversal of 138443593 is 395344831.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 451584 + 137992009 = 672^2 + 11747^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138443593 - 2¹⁷ = 138312521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138443993) 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 7 ways as a sum of consecutive naturals, for example, 57030 + ... + 59407.

It is an arithmetic number, because the mean of its divisors is an integer number (18338985).

Almost surely, 2^138443593 is an apocalyptic number.

It is an amenable number.

138443593 is a deficient number, since it is larger than the sum of its proper divisors (8268287).

138443593 is a wasteful number, since it uses less digits than its factorization.

138443593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116507.

The product of its digits is 155520, while the sum is 40.

The square root of 138443593 is about 11766.2055480941. The cubic root of 138443593 is about 517.3180366424.

The spelling of 138443593 in words is "one hundred thirty-eight million, four hundred forty-three thousand, five hundred ninety-three".