816822387 has 24 divisors (see below), whose sum is σ = 1230028800. Its totient is φ = 541666440.

The previous prime is 816822361. The next prime is 816822401. The reversal of 816822387 is 783228618.

It is not a de Polignac number, because 816822387 - 2¹¹ = 816820339 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (816822337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37614 + ... + 55212.

It is an arithmetic number, because the mean of its divisors is an integer number (51251200).

Almost surely, 2^816822387 is an apocalyptic number.

816822387 is a deficient number, since it is larger than the sum of its proper divisors (413206413).

816822387 is a wasteful number, since it uses less digits than its factorization.

816822387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17805 (or 17793 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 816822387 is about 28580.1047408857. The cubic root of 816822387 is about 934.7795669359.

The spelling of 816822387 in words is "eight hundred sixteen million, eight hundred twenty-two thousand, three hundred eighty-seven".