809940023 has 8 divisors (see below), whose sum is σ = 824732160. Its totient is φ = 795183480.

The previous prime is 809940013. The next prime is 809940041. The reversal of 809940023 is 320049908.

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

It is a cyclic number.

It is not a de Polignac number, because 809940023 - 2²⁸ = 541504567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809940013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39386 + ... + 56312.

It is an arithmetic number, because the mean of its divisors is an integer number (103091520).

Almost surely, 2^809940023 is an apocalyptic number.

809940023 is a deficient number, since it is larger than the sum of its proper divisors (14792137).

809940023 is a wasteful number, since it uses less digits than its factorization.

809940023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17797.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 809940023 is about 28459.4452335248. The cubic root of 809940023 is about 932.1467435042.

The spelling of 809940023 in words is "eight hundred nine million, nine hundred forty thousand, twenty-three".