139842823 has 2 divisors, whose sum is σ = 139842824. Its totient is φ = 139842822.

The previous prime is 139842821. The next prime is 139842839. The reversal of 139842823 is 328248931.

It is a weak prime.

It is an emirp because it is prime and its reverse (328248931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139842823 - 2¹ = 139842821 is a prime.

Together with 139842821, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139842821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69921411 + 69921412.

It is an arithmetic number, because the mean of its divisors is an integer number (69921412).

Almost surely, 2^139842823 is an apocalyptic number.

139842823 is a deficient number, since it is larger than the sum of its proper divisors (1).

139842823 is an equidigital number, since it uses as much as digits as its factorization.

139842823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 40.

The square root of 139842823 is about 11825.5157604225. The cubic root of 139842823 is about 519.0550182182.

It can be divided in two parts, 13984 and 2823, that added together give a 5-th power (16807 = 7⁵).

The spelling of 139842823 in words is "one hundred thirty-nine million, eight hundred forty-two thousand, eight hundred twenty-three".