840349429 has 2 divisors, whose sum is σ = 840349430. Its totient is φ = 840349428.

The previous prime is 840349427. The next prime is 840349441. The reversal of 840349429 is 924943048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 660387204 + 179962225 = 25698^2 + 13415^2 .

It is a cyclic number.

It is not a de Polignac number, because 840349429 - 2¹ = 840349427 is a prime.

Together with 840349427, 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 (840349427) 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, 420174714 + 420174715.

It is an arithmetic number, because the mean of its divisors is an integer number (420174715).

Almost surely, 2^840349429 is an apocalyptic number.

It is an amenable number.

840349429 is a deficient number, since it is larger than the sum of its proper divisors (1).

840349429 is an equidigital number, since it uses as much as digits as its factorization.

840349429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 43.

The square root of 840349429 is about 28988.7810885522. The cubic root of 840349429 is about 943.6696111870.

The spelling of 840349429 in words is "eight hundred forty million, three hundred forty-nine thousand, four hundred twenty-nine".