139078243 has 2 divisors, whose sum is σ = 139078244. Its totient is φ = 139078242.

The previous prime is 139078189. The next prime is 139078249. The reversal of 139078243 is 342870931.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139078243 is a prime.

It is not a weakly prime, because it can be changed into another prime (139078249) 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 as a sum of consecutive naturals, namely, 69539121 + 69539122.

It is an arithmetic number, because the mean of its divisors is an integer number (69539122).

Almost surely, 2^139078243 is an apocalyptic number.

139078243 is a deficient number, since it is larger than the sum of its proper divisors (1).

139078243 is an equidigital number, since it uses as much as digits as its factorization.

139078243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 139078243 is about 11793.1438980452. The cubic root of 139078243 is about 518.1073243529.

The spelling of 139078243 in words is "one hundred thirty-nine million, seventy-eight thousand, two hundred forty-three".