820043 has 8 divisors (see below), whose sum is σ = 967680. Its totient is φ = 680040.

The previous prime is 820037. The next prime is 820051. The reversal of 820043 is 340028.

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

It is a cyclic number.

It is not a de Polignac number, because 820043 - 2⁸ = 819787 is a prime.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (820073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1673 + ... + 2106.

It is an arithmetic number, because the mean of its divisors is an integer number (120960).

2⁸²⁰⁰⁴³ is an apocalyptic number.

820043 is a deficient number, since it is larger than the sum of its proper divisors (147637).

820043 is a wasteful number, since it uses less digits than its factorization.

820043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3817.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 820043 is about 905.5622562806. The cubic root of 820043 is about 93.6006522832.

The spelling of 820043 in words is "eight hundred twenty thousand, forty-three".