138807443 has 4 divisors (see below), whose sum is σ = 138841248. Its totient is φ = 138773640.

The previous prime is 138807419. The next prime is 138807463. The reversal of 138807443 is 344708831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 344708831 = 15761 ⋅21871.

It is a cyclic number.

It is not a de Polignac number, because 138807443 - 2¹² = 138803347 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138807397 and 138807406.

It is not an unprimeable number, because it can be changed into a prime (138807413) 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, 9728 + ... + 19293.

It is an arithmetic number, because the mean of its divisors is an integer number (34710312).

Almost surely, 2^138807443 is an apocalyptic number.

138807443 is a deficient number, since it is larger than the sum of its proper divisors (33805).

138807443 is an equidigital number, since it uses as much as digits as its factorization.

138807443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33804.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 138807443 is about 11781.6570566283. The cubic root of 138807443 is about 517.7708360067.

The spelling of 138807443 in words is "one hundred thirty-eight million, eight hundred seven thousand, four hundred forty-three".