999143816 has 32 divisors (see below), whose sum is σ = 2045260800. Its totient is φ = 453810240.

The previous prime is 999143807. The next prime is 999143867. The reversal of 999143816 is 618341999.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138425 + ... + 145463.

It is an arithmetic number, because the mean of its divisors is an integer number (63914400).

Almost surely, 2^999143816 is an apocalyptic number.

It is an amenable number.

999143816 is an abundant number, since it is smaller than the sum of its proper divisors (1046116984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999143816 is a wasteful number, since it uses less digits than its factorization.

999143816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8669 (or 8665 counting only the distinct ones).

The product of its digits is 419904, while the sum is 50.

The square root of 999143816 is about 31609.2362451230. The cubic root of 999143816 is about 999.7145238445.

The spelling of 999143816 in words is "nine hundred ninety-nine million, one hundred forty-three thousand, eight hundred sixteen".