820187 has 2 divisors, whose sum is σ = 820188. Its totient is φ = 820186.

The previous prime is 820177. The next prime is 820201. The reversal of 820187 is 781028.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 820187 - 2¹² = 816091 is a prime.

It is a Chen prime.

It is a plaindrome in base 12.

It is not a weakly prime, because it can be changed into another prime (820117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410093 + 410094.

It is an arithmetic number, because the mean of its divisors is an integer number (410094).

2⁸²⁰¹⁸⁷ is an apocalyptic number.

820187 is a deficient number, since it is larger than the sum of its proper divisors (1).

820187 is an equidigital number, since it uses as much as digits as its factorization.

820187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 820187 is about 905.6417614046. The cubic root of 820187 is about 93.6061307378.

The spelling of 820187 in words is "eight hundred twenty thousand, one hundred eighty-seven".