104242639 has 2 divisors, whose sum is σ = 104242640. Its totient is φ = 104242638.

The previous prime is 104242609. The next prime is 104242669. The reversal of 104242639 is 936242401.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (104242609) and next prime (104242669).

It is an emirp because it is prime and its reverse (936242401) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 104242639 - 2¹³ = 104234447 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 104242639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (104242609) 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, 52121319 + 52121320.

It is an arithmetic number, because the mean of its divisors is an integer number (52121320).

Almost surely, 2^104242639 is an apocalyptic number.

104242639 is a deficient number, since it is larger than the sum of its proper divisors (1).

104242639 is an equidigital number, since it uses as much as digits as its factorization.

104242639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 104242639 is about 10209.9284522469. The cubic root of 104242639 is about 470.6323749672.

It can be divided in two parts, 1042 and 42639, that added together give a square (43681 = 209²).

The spelling of 104242639 in words is "one hundred four million, two hundred forty-two thousand, six hundred thirty-nine".