840157793 has 2 divisors, whose sum is σ = 840157794. Its totient is φ = 840157792.

The previous prime is 840157783. The next prime is 840157841. The reversal of 840157793 is 397751048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 552109009 + 288048784 = 23497^2 + 16972^2 .

It is a cyclic number.

It is not a de Polignac number, because 840157793 - 2⁶ = 840157729 is a prime.

It is not a weakly prime, because it can be changed into another prime (840157763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420078896 + 420078897.

It is an arithmetic number, because the mean of its divisors is an integer number (420078897).

Almost surely, 2^840157793 is an apocalyptic number.

It is an amenable number.

840157793 is a deficient number, since it is larger than the sum of its proper divisors (1).

840157793 is an equidigital number, since it uses as much as digits as its factorization.

840157793 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 840157793 is about 28985.4755524211. The cubic root of 840157793 is about 943.5978732441.

The spelling of 840157793 in words is "eight hundred forty million, one hundred fifty-seven thousand, seven hundred ninety-three".