816919642 has 24 divisors (see below), whose sum is σ = 1539322848. Its totient is φ = 318279720.

The previous prime is 816919639. The next prime is 816919661. The reversal of 816919642 is 246919618.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 816919592 and 816919601.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 239428 + ... + 242815.

It is an arithmetic number, because the mean of its divisors is an integer number (64138452).

Almost surely, 2^816919642 is an apocalyptic number.

816919642 is a deficient number, since it is larger than the sum of its proper divisors (722403206).

816919642 is a wasteful number, since it uses less digits than its factorization.

816919642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482274 (or 482263 counting only the distinct ones).

The product of its digits is 186624, while the sum is 46.

The square root of 816919642 is about 28581.8061360719. The cubic root of 816919642 is about 934.8166653229.

The spelling of 816919642 in words is "eight hundred sixteen million, nine hundred nineteen thousand, six hundred forty-two".