139189823 has 2 divisors, whose sum is σ = 139189824. Its totient is φ = 139189822.

The previous prime is 139189811. The next prime is 139189847. The reversal of 139189823 is 328981931.

It is a weak prime.

It is an emirp because it is prime and its reverse (328981931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139189823 - 2¹⁰ = 139188799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139189873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69594911 + 69594912.

It is an arithmetic number, because the mean of its divisors is an integer number (69594912).

Almost surely, 2^139189823 is an apocalyptic number.

139189823 is a deficient number, since it is larger than the sum of its proper divisors (1).

139189823 is an equidigital number, since it uses as much as digits as its factorization.

139189823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 44.

The square root of 139189823 is about 11797.8736643516. The cubic root of 139189823 is about 518.2458434119.

The spelling of 139189823 in words is "one hundred thirty-nine million, one hundred eighty-nine thousand, eight hundred twenty-three".