823816385 has 8 divisors (see below), whose sum is σ = 1129805376. Its totient is φ = 564902640.

The previous prime is 823816349. The next prime is 823816429. The reversal of 823816385 is 583618328.

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

It is not a de Polignac number, because 823816385 - 2¹⁴ = 823800001 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11768771 + ... + 11768840.

It is an arithmetic number, because the mean of its divisors is an integer number (141225672).

Almost surely, 2^823816385 is an apocalyptic number.

It is an amenable number.

823816385 is a deficient number, since it is larger than the sum of its proper divisors (305988991).

823816385 is a wasteful number, since it uses less digits than its factorization.

823816385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23537623.

The product of its digits is 276480, while the sum is 44.

The square root of 823816385 is about 28702.2017448139. The cubic root of 823816385 is about 937.4399880993.

The spelling of 823816385 in words is "eight hundred twenty-three million, eight hundred sixteen thousand, three hundred eighty-five".