820442 has 8 divisors (see below), whose sum is σ = 1406496. Its totient is φ = 351612.

The previous prime is 820441. The next prime is 820459. The reversal of 820442 is 244028.

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

It is not an unprimeable number, because it can be changed into a prime (820441) 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, 29288 + ... + 29315.

It is an arithmetic number, because the mean of its divisors is an integer number (175812).

2⁸²⁰⁴⁴² is an apocalyptic number.

820442 is a deficient number, since it is larger than the sum of its proper divisors (586054).

820442 is a wasteful number, since it uses less digits than its factorization.

820442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58612.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 820442 is about 905.7825346075. The cubic root of 820442 is about 93.6158305949.

The spelling of 820442 in words is "eight hundred twenty thousand, four hundred forty-two".