138467443 has 4 divisors (see below), whose sum is σ = 138598768. Its totient is φ = 138336120.

The previous prime is 138467423. The next prime is 138467447. The reversal of 138467443 is 344764831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 344764831 = 4723 ⋅72997.

It is a cyclic number.

It is not a de Polignac number, because 138467443 - 2⁹ = 138466931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138467396 and 138467405.

It is not an unprimeable number, because it can be changed into a prime (138467447) 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, 64068 + ... + 66193.

It is an arithmetic number, because the mean of its divisors is an integer number (34649692).

Almost surely, 2^138467443 is an apocalyptic number.

138467443 is a deficient number, since it is larger than the sum of its proper divisors (131325).

138467443 is a wasteful number, since it uses less digits than its factorization.

138467443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131324.

The product of its digits is 193536, while the sum is 40.

The square root of 138467443 is about 11767.2190002566. The cubic root of 138467443 is about 517.3477414641.

The spelling of 138467443 in words is "one hundred thirty-eight million, four hundred sixty-seven thousand, four hundred forty-three".