820894423 has 2 divisors, whose sum is σ = 820894424. Its totient is φ = 820894422.

The previous prime is 820894409. The next prime is 820894429. The reversal of 820894423 is 324498028.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 820894423 - 2⁵ = 820894391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820894429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410447211 + 410447212.

It is an arithmetic number, because the mean of its divisors is an integer number (410447212).

Almost surely, 2^820894423 is an apocalyptic number.

820894423 is a deficient number, since it is larger than the sum of its proper divisors (1).

820894423 is an equidigital number, since it uses as much as digits as its factorization.

820894423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 820894423 is about 28651.2551732031. The cubic root of 820894423 is about 936.3303521227.

The spelling of 820894423 in words is "eight hundred twenty million, eight hundred ninety-four thousand, four hundred twenty-three".