811387 has 2 divisors, whose sum is σ = 811388. Its totient is φ = 811386.

The previous prime is 811379. The next prime is 811411. The reversal of 811387 is 783118.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 811387 - 2³ = 811379 is a prime.

It is a Chen prime.

811387 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (811337) 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, 405693 + 405694.

It is an arithmetic number, because the mean of its divisors is an integer number (405694).

2⁸¹¹³⁸⁷ is an apocalyptic number.

811387 is a deficient number, since it is larger than the sum of its proper divisors (1).

811387 is an equidigital number, since it uses as much as digits as its factorization.

811387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 28.

The square root of 811387 is about 900.7702259733. The cubic root of 811387 is about 93.2701513997.

The spelling of 811387 in words is "eight hundred eleven thousand, three hundred eighty-seven".