809643854 has 8 divisors (see below), whose sum is σ = 1218850968. Its totient is φ = 403360200.

The previous prime is 809643841. The next prime is 809643859. The reversal of 809643854 is 458346908.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 809643799 and 809643808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809643859) 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 in 3 ways as a sum of consecutive naturals, for example, 730172 + ... + 731279.

It is an arithmetic number, because the mean of its divisors is an integer number (152356371).

Almost surely, 2^809643854 is an apocalyptic number.

809643854 is a deficient number, since it is larger than the sum of its proper divisors (409207114).

809643854 is a wasteful number, since it uses less digits than its factorization.

809643854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1461730.

The product of its (nonzero) digits is 829440, while the sum is 47.

The square root of 809643854 is about 28454.2414061595. The cubic root of 809643854 is about 932.0331109642.

The spelling of 809643854 in words is "eight hundred nine million, six hundred forty-three thousand, eight hundred fifty-four".