816844385 has 8 divisors (see below), whose sum is σ = 1120243776. Its totient is φ = 560121840.

The previous prime is 816844381. The next prime is 816844387. The reversal of 816844385 is 583448618.

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

It is not a de Polignac number, because 816844385 - 2² = 816844381 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816844381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11669171 + ... + 11669240.

It is an arithmetic number, because the mean of its divisors is an integer number (140030472).

Almost surely, 2^816844385 is an apocalyptic number.

It is an amenable number.

816844385 is a deficient number, since it is larger than the sum of its proper divisors (303399391).

816844385 is a wasteful number, since it uses less digits than its factorization.

816844385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23338423.

The product of its digits is 737280, while the sum is 47.

The square root of 816844385 is about 28580.4895864294. The cubic root of 816844385 is about 934.7879584364.

The spelling of 816844385 in words is "eight hundred sixteen million, eight hundred forty-four thousand, three hundred eighty-five".