1620823 has 2 divisors, whose sum is σ = 1620824. Its totient is φ = 1620822.

The previous prime is 1620811. The next prime is 1620841. The reversal of 1620823 is 3280261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1620823 - 2¹⁷ = 1489751 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1620794 and 1620803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620803) 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, 810411 + 810412.

It is an arithmetic number, because the mean of its divisors is an integer number (810412).

2^1620823 is an apocalyptic number.

1620823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620823 is an equidigital number, since it uses as much as digits as its factorization.

1620823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1620823 is about 1273.1154700183. The cubic root of 1620823 is about 117.4659143623.

The spelling of 1620823 in words is "one million, six hundred twenty thousand, eight hundred twenty-three".