138445843 has 8 divisors (see below), whose sum is σ = 139941200. Its totient is φ = 136958688.

The previous prime is 138445831. The next prime is 138445859. The reversal of 138445843 is 348544831.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138445843 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138445796 and 138445805.

It is not an unprimeable number, because it can be changed into a prime (138445543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35473 + ... + 39181.

It is an arithmetic number, because the mean of its divisors is an integer number (17492650).

Almost surely, 2^138445843 is an apocalyptic number.

138445843 is a deficient number, since it is larger than the sum of its proper divisors (1495357).

138445843 is a wasteful number, since it uses less digits than its factorization.

138445843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4101.

The product of its digits is 184320, while the sum is 40.

The square root of 138445843 is about 11766.3011605177. The cubic root of 138445843 is about 517.3208391298.

The spelling of 138445843 in words is "one hundred thirty-eight million, four hundred forty-five thousand, eight hundred forty-three".