823730865 has 16 divisors (see below), whose sum is σ = 1318405248. Its totient is φ = 439177856.

The previous prime is 823730863. The next prime is 823730879. The reversal of 823730865 is 568037328.

It is a cyclic number.

It is not a de Polignac number, because 823730865 - 2¹ = 823730863 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (823730863) 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, 50332 + ... + 64658.

It is an arithmetic number, because the mean of its divisors is an integer number (82400328).

Almost surely, 2^823730865 is an apocalyptic number.

It is an amenable number.

823730865 is a deficient number, since it is larger than the sum of its proper divisors (494674383).

823730865 is a wasteful number, since it uses less digits than its factorization.

823730865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18168.

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 823730865 is about 28700.7119249680. The cubic root of 823730865 is about 937.4075485721.

The spelling of 823730865 in words is "eight hundred twenty-three million, seven hundred thirty thousand, eight hundred sixty-five".