840729349 has 2 divisors, whose sum is σ = 840729350. Its totient is φ = 840729348.

The previous prime is 840729341. The next prime is 840729367. The reversal of 840729349 is 943927048.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 765352225 + 75377124 = 27665^2 + 8682^2 .

It is a cyclic number.

It is not a de Polignac number, because 840729349 - 2³ = 840729341 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 840729299 and 840729308.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840729341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420364674 + 420364675.

It is an arithmetic number, because the mean of its divisors is an integer number (420364675).

Almost surely, 2^840729349 is an apocalyptic number.

It is an amenable number.

840729349 is a deficient number, since it is larger than the sum of its proper divisors (1).

840729349 is an equidigital number, since it uses as much as digits as its factorization.

840729349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 840729349 is about 28995.3332279524. Note that the first 3 decimals coincide. The cubic root of 840729349 is about 943.8118000318.

The spelling of 840729349 in words is "eight hundred forty million, seven hundred twenty-nine thousand, three hundred forty-nine".