820499 has 4 divisors (see below), whose sum is σ = 823200. Its totient is φ = 817800.

The previous prime is 820489. The next prime is 820537. The reversal of 820499 is 994028.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 820499 - 2⁸ = 820243 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (820409) 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, 827 + ... + 1524.

It is an arithmetic number, because the mean of its divisors is an integer number (205800).

2⁸²⁰⁴⁹⁹ is an apocalyptic number.

820499 is a deficient number, since it is larger than the sum of its proper divisors (2701).

820499 is a wasteful number, since it uses less digits than its factorization.

820499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2700.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 820499 is about 905.8139985670. The cubic root of 820499 is about 93.6179985234.

The spelling of 820499 in words is "eight hundred twenty thousand, four hundred ninety-nine".