840143689 has 16 divisors (see below), whose sum is σ = 1109068416. Its totient is φ = 616147200.

The previous prime is 840143677. The next prime is 840143743. The reversal of 840143689 is 986341048.

It is a cyclic number.

It is not a de Polignac number, because 840143689 - 2¹¹ = 840141641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840144689) 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 in 15 ways as a sum of consecutive naturals, for example, 319602 + ... + 322219.

It is an arithmetic number, because the mean of its divisors is an integer number (69316776).

Almost surely, 2^840143689 is an apocalyptic number.

It is an amenable number.

840143689 is a deficient number, since it is larger than the sum of its proper divisors (268924727).

840143689 is a wasteful number, since it uses less digits than its factorization.

840143689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641856.

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 840143689 is about 28985.2322571340. The cubic root of 840143689 is about 943.5925930539.

The spelling of 840143689 in words is "eight hundred forty million, one hundred forty-three thousand, six hundred eighty-nine".