840628843 has 2 divisors, whose sum is σ = 840628844. Its totient is φ = 840628842.

The previous prime is 840628807. The next prime is 840628847. The reversal of 840628843 is 348826048.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 840628843 - 2⁹ = 840628331 is a prime.

It is a super-3 number, since 3×840628843³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 840628843.

It is not a weakly prime, because it can be changed into another prime (840628847) 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, 420314421 + 420314422.

It is an arithmetic number, because the mean of its divisors is an integer number (420314422).

Almost surely, 2^840628843 is an apocalyptic number.

840628843 is a deficient number, since it is larger than the sum of its proper divisors (1).

840628843 is an equidigital number, since it uses as much as digits as its factorization.

840628843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 294912, while the sum is 43.

The square root of 840628843 is about 28993.6000351802. The cubic root of 840628843 is about 943.7741888279.

It can be divided in two parts, 8406 and 28843, that added together give a square (37249 = 193²).

The spelling of 840628843 in words is "eight hundred forty million, six hundred twenty-eight thousand, eight hundred forty-three".