820418 has 8 divisors (see below), whose sum is σ = 1235520. Its totient is φ = 408580.

The previous prime is 820411. The next prime is 820427. The reversal of 820418 is 814028.

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

It is a junction number, because it is equal to n+sod(n) for n = 820393 and 820402.

It is not an unprimeable number, because it can be changed into a prime (820411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38 + ... + 1281.

It is an arithmetic number, because the mean of its divisors is an integer number (154440).

2⁸²⁰⁴¹⁸ is an apocalyptic number.

820418 is a deficient number, since it is larger than the sum of its proper divisors (415102).

820418 is a wasteful number, since it uses less digits than its factorization.

820418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 820418 is about 905.7692862976. The cubic root of 820418 is about 93.6149177528.

The spelling of 820418 in words is "eight hundred twenty thousand, four hundred eighteen".