816988923 has 20 divisors (see below), whose sum is σ = 1284676360. Its totient is φ = 515992032.

The previous prime is 816988901. The next prime is 816988943. The reversal of 816988923 is 329889618.

It is a happy number.

816988923 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 816988923 - 2⁹ = 816988411 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 816988923.

It is not an unprimeable number, because it can be changed into a prime (816988943) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 263890 + ... + 266967.

It is an arithmetic number, because the mean of its divisors is an integer number (64233818).

Almost surely, 2^816988923 is an apocalyptic number.

816988923 is a deficient number, since it is larger than the sum of its proper divisors (467687437).

816988923 is a wasteful number, since it uses less digits than its factorization.

816988923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530888 (or 530879 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 54.

The square root of 816988923 is about 28583.0180876688. The cubic root of 816988923 is about 934.8430910973.

The spelling of 816988923 in words is "eight hundred sixteen million, nine hundred eighty-eight thousand, nine hundred twenty-three".