820490 has 16 divisors (see below), whose sum is σ = 1611360. Its totient is φ = 298320.

The previous prime is 820489. The next prime is 820537. The reversal of 820490 is 94028.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3620 + ... + 3839.

It is an arithmetic number, because the mean of its divisors is an integer number (100710).

2⁸²⁰⁴⁹⁰ is an apocalyptic number.

820490 is a deficient number, since it is larger than the sum of its proper divisors (790870).

820490 is a wasteful number, since it uses less digits than its factorization.

820490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7477.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 820490 is about 905.8090306461. The cubic root of 820490 is about 93.6176562255.

The spelling of 820490 in words is "eight hundred twenty thousand, four hundred ninety".