809872923 has 16 divisors (see below), whose sum is σ = 1118287872. Its totient is φ = 520800000.

The previous prime is 809872871. The next prime is 809872951. The reversal of 809872923 is 329278908.

It is a happy number.

It is not a de Polignac number, because 809872923 - 2¹⁶ = 809807387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (809872423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14923 + ... + 42923.

It is an arithmetic number, because the mean of its divisors is an integer number (69892992).

Almost surely, 2^809872923 is an apocalyptic number.

809872923 is a deficient number, since it is larger than the sum of its proper divisors (308414949).

809872923 is a wasteful number, since it uses less digits than its factorization.

809872923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28346.

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 809872923 is about 28458.2663386229. The cubic root of 809872923 is about 932.1210013620.

The spelling of 809872923 in words is "eight hundred nine million, eight hundred seventy-two thousand, nine hundred twenty-three".