840213723829 has 2 divisors, whose sum is σ = 840213723830. Its totient is φ = 840213723828.

The previous prime is 840213723821. The next prime is 840213723859. The reversal of 840213723829 is 928327312048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 441989621329 + 398224102500 = 664823^2 + 631050^2 .

It is a cyclic number.

It is not a de Polignac number, because 840213723829 - 2³ = 840213723821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840213723821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420106861914 + 420106861915.

It is an arithmetic number, because the mean of its divisors is an integer number (420106861915).

Almost surely, 2^840213723829 is an apocalyptic number.

It is an amenable number.

840213723829 is a deficient number, since it is larger than the sum of its proper divisors (1).

840213723829 is an equidigital number, since it uses as much as digits as its factorization.

840213723829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1161216, while the sum is 49.

The spelling of 840213723829 in words is "eight hundred forty billion, two hundred thirteen million, seven hundred twenty-three thousand, eight hundred twenty-nine".