138928843 has 2 divisors, whose sum is σ = 138928844. Its totient is φ = 138928842.

The previous prime is 138928831. The next prime is 138928849. The reversal of 138928843 is 348829831.

138928843 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138928843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138928793 and 138928802.

It is not a weakly prime, because it can be changed into another prime (138928849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69464421 + 69464422.

It is an arithmetic number, because the mean of its divisors is an integer number (69464422).

Almost surely, 2^138928843 is an apocalyptic number.

138928843 is a deficient number, since it is larger than the sum of its proper divisors (1).

138928843 is an equidigital number, since it uses as much as digits as its factorization.

138928843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 331776, while the sum is 46.

The square root of 138928843 is about 11786.8080072596. The cubic root of 138928843 is about 517.9217382498.

The spelling of 138928843 in words is "one hundred thirty-eight million, nine hundred twenty-eight thousand, eight hundred forty-three".