420834 has 8 divisors (see below), whose sum is σ = 841680. Its totient is φ = 140276.

The previous prime is 420811. The next prime is 420851. The reversal of 420834 is 438024.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

420834 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 420834.

It is an unprimeable number.

420834 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 in 3 ways as a sum of consecutive naturals, for example, 35064 + ... + 35075.

It is an arithmetic number, because the mean of its divisors is an integer number (105210).

2⁴²⁰⁸³⁴ is an apocalyptic number.

420834 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

420834 is a wasteful number, since it uses less digits than its factorization.

420834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70144.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 420834 is about 648.7171957024. The cubic root of 420834 is about 74.9382603012.

Adding to 420834 its reverse (438024), we get a palindrome (858858).

The spelling of 420834 in words is "four hundred twenty thousand, eight hundred thirty-four".