840518411429 has 2 divisors, whose sum is σ = 840518411430. Its totient is φ = 840518411428.

The previous prime is 840518411423. The next prime is 840518411507. The reversal of 840518411429 is 924114815048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 446755886404 + 393762525025 = 668398^2 + 627505^2 .

It is a cyclic number.

It is not a de Polignac number, because 840518411429 - 2¹⁶ = 840518345893 is a prime.

It is a super-2 number, since 2×840518411429² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840518411423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420259205714 + 420259205715.

It is an arithmetic number, because the mean of its divisors is an integer number (420259205715).

Almost surely, 2^840518411429 is an apocalyptic number.

It is an amenable number.

840518411429 is a deficient number, since it is larger than the sum of its proper divisors (1).

840518411429 is an equidigital number, since it uses as much as digits as its factorization.

840518411429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 368640, while the sum is 47.

The spelling of 840518411429 in words is "eight hundred forty billion, five hundred eighteen million, four hundred eleven thousand, four hundred twenty-nine".