800823921 has 16 divisors (see below), whose sum is σ = 1086650688. Its totient is φ = 524462400.

The previous prime is 800823911. The next prime is 800824019. The reversal of 800823921 is 129328008.

It is not a de Polignac number, because 800823921 - 2⁵ = 800823889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (800823911) 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 in 15 ways as a sum of consecutive naturals, for example, 170991 + ... + 175611.

It is an arithmetic number, because the mean of its divisors is an integer number (67915668).

Almost surely, 2^800823921 is an apocalyptic number.

It is an amenable number.

800823921 is a deficient number, since it is larger than the sum of its proper divisors (285826767).

800823921 is a wasteful number, since it uses less digits than its factorization.

800823921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5632.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 800823921 is about 28298.8325024196. The cubic root of 800823921 is about 928.6363492542.

The spelling of 800823921 in words is "eight hundred million, eight hundred twenty-three thousand, nine hundred twenty-one".