816143992 has 8 divisors (see below), whose sum is σ = 1530270000. Its totient is φ = 408071992.

The previous prime is 816143963. The next prime is 816144019. The reversal of 816143992 is 299341618.

It is a happy number.

816143992 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51008992 + ... + 51009007.

It is an arithmetic number, because the mean of its divisors is an integer number (191283750).

Almost surely, 2^816143992 is an apocalyptic number.

It is an amenable number.

816143992 is a deficient number, since it is larger than the sum of its proper divisors (714126008).

816143992 is a wasteful number, since it uses less digits than its factorization.

816143992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102018005 (or 102018001 counting only the distinct ones).

The product of its digits is 93312, while the sum is 43.

The square root of 816143992 is about 28568.2339671181. The cubic root of 816143992 is about 934.5207079577.

The spelling of 816143992 in words is "eight hundred sixteen million, one hundred forty-three thousand, nine hundred ninety-two".