138443133 has 4 divisors (see below), whose sum is σ = 184590848. Its totient is φ = 92295420.

The previous prime is 138443131. The next prime is 138443147. The reversal of 138443133 is 331344831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 138443133 - 2¹ = 138443131 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 138443133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138443131) 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, 23073853 + ... + 23073858.

It is an arithmetic number, because the mean of its divisors is an integer number (46147712).

Almost surely, 2^138443133 is an apocalyptic number.

It is an amenable number.

138443133 is a deficient number, since it is larger than the sum of its proper divisors (46147715).

138443133 is an equidigital number, since it uses as much as digits as its factorization.

138443133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46147714.

The product of its digits is 10368, while the sum is 30.

The square root of 138443133 is about 11766.1860005696. The cubic root of 138443133 is about 517.3174636857.

Adding to 138443133 its reverse (331344831), we get a palindrome (469787964).

The spelling of 138443133 in words is "one hundred thirty-eight million, four hundred forty-three thousand, one hundred thirty-three".