840229 has 4 divisors (see below), whose sum is σ = 904876. Its totient is φ = 775584.

The previous prime is 840223. The next prime is 840239. The reversal of 840229 is 922048.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 277729 + 562500 = 527^2 + 750^2 .

It is a cyclic number.

It is not a de Polignac number, because 840229 - 2⁵ = 840197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32304 + ... + 32329.

It is an arithmetic number, because the mean of its divisors is an integer number (226219).

2⁸⁴⁰²²⁹ is an apocalyptic number.

It is an amenable number.

840229 is a deficient number, since it is larger than the sum of its proper divisors (64647).

840229 is a wasteful number, since it uses less digits than its factorization.

840229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64646.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 840229 is about 916.6400602199. The cubic root of 840229 is about 94.3624530489.

The spelling of 840229 in words is "eight hundred forty thousand, two hundred twenty-nine".