820299 has 4 divisors (see below), whose sum is σ = 1093736. Its totient is φ = 546864.

The previous prime is 820279. The next prime is 820319. The reversal of 820299 is 992028.

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

It is an interprime number because it is at equal distance from previous prime (820279) and next prime (820319).

It is not a de Polignac number, because 820299 - 2⁹ = 819787 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820279) 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, 136714 + ... + 136719.

It is an arithmetic number, because the mean of its divisors is an integer number (273434).

2⁸²⁰²⁹⁹ is an apocalyptic number.

820299 is a deficient number, since it is larger than the sum of its proper divisors (273437).

820299 is a wasteful number, since it uses less digits than its factorization.

820299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273436.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 820299 is about 905.7035938981. The cubic root of 820299 is about 93.6103913147.

The spelling of 820299 in words is "eight hundred twenty thousand, two hundred ninety-nine".