820434 has 8 divisors (see below), whose sum is σ = 1640880. Its totient is φ = 273476.

The previous prime is 820429. The next prime is 820441. The reversal of 820434 is 434028.

It is a happy number.

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

820434 is an admirable number.

It is a super-2 number, since 2×820434² = 1346223896712, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 820434.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68364 + ... + 68375.

It is an arithmetic number, because the mean of its divisors is an integer number (205110).

2⁸²⁰⁴³⁴ is an apocalyptic number.

820434 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.

820434 is a wasteful number, since it uses less digits than its factorization.

820434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136744.

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

The square root of 820434 is about 905.7781185257. The cubic root of 820434 is about 93.6155263162.

The spelling of 820434 in words is "eight hundred twenty thousand, four hundred thirty-four".