840299 has 2 divisors, whose sum is σ = 840300. Its totient is φ = 840298.

The previous prime is 840289. The next prime is 840319. The reversal of 840299 is 992048.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 840299 - 2¹² = 836203 is a prime.

It is a super-2 number, since 2×840299² = 1412204818802, which contains 22 as substring.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 840299.

It is not a weakly prime, because it can be changed into another prime (840239) 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, 420149 + 420150.

It is an arithmetic number, because the mean of its divisors is an integer number (420150).

2⁸⁴⁰²⁹⁹ is an apocalyptic number.

840299 is a deficient number, since it is larger than the sum of its proper divisors (1).

840299 is an equidigital number, since it uses as much as digits as its factorization.

840299 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 840299 is about 916.6782423512. The cubic root of 840299 is about 94.3650734410.

The spelling of 840299 in words is "eight hundred forty thousand, two hundred ninety-nine".