1020823 has 2 divisors, whose sum is σ = 1020824. Its totient is φ = 1020822.

The previous prime is 1020821. The next prime is 1020827. The reversal of 1020823 is 3280201.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1020823 - 2¹ = 1020821 is a prime.

Together with 1020821, it forms a pair of twin primes.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1020797 and 1020806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510411 + 510412.

It is an arithmetic number, because the mean of its divisors is an integer number (510412).

2^1020823 is an apocalyptic number.

1020823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020823 is an equidigital number, since it uses as much as digits as its factorization.

1020823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1020823 is about 1010.3578573951. The cubic root of 1020823 is about 100.6893372232.

The spelling of 1020823 in words is "one million, twenty thousand, eight hundred twenty-three".