820279 has 2 divisors, whose sum is σ = 820280. Its totient is φ = 820278.

The previous prime is 820273. The next prime is 820319. The reversal of 820279 is 972028.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 820279 - 2³ = 820271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410139 + 410140.

It is an arithmetic number, because the mean of its divisors is an integer number (410140).

2⁸²⁰²⁷⁹ is an apocalyptic number.

820279 is a deficient number, since it is larger than the sum of its proper divisors (1).

820279 is an equidigital number, since it uses as much as digits as its factorization.

820279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 820279 is about 905.6925526910. The cubic root of 820279 is about 93.6096305259.

It can be divided in two parts, 8202 and 79, that added together give a square (8281 = 91²).

The spelling of 820279 in words is "eight hundred twenty thousand, two hundred seventy-nine".