820042 has 8 divisors (see below), whose sum is σ = 1283616. Its totient is φ = 392172.

The previous prime is 820037. The next prime is 820051. The reversal of 820042 is 240028.

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

It is a plaindrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 819998 and 820025.

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, 8868 + ... + 8959.

It is an arithmetic number, because the mean of its divisors is an integer number (160452).

2⁸²⁰⁰⁴² is an apocalyptic number.

820042 is a deficient number, since it is larger than the sum of its proper divisors (463574).

820042 is a wasteful number, since it uses less digits than its factorization.

820042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17852.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 820042 is about 905.5617041373. The cubic root of 820042 is about 93.6006142361.

The spelling of 820042 in words is "eight hundred twenty thousand, forty-two".