999143818 has 4 divisors (see below), whose sum is σ = 1498715730. Its totient is φ = 499571908.

The previous prime is 999143807. The next prime is 999143867. The reversal of 999143818 is 818341999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 818341999 = 31 ⋅26398129.

It can be written as a sum of positive squares in only one way, i.e., 998117649 + 1026169 = 31593^2 + 1013^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 249785953 + ... + 249785956.

Almost surely, 2^999143818 is an apocalyptic number.

999143818 is a deficient number, since it is larger than the sum of its proper divisors (499571912).

999143818 is a wasteful number, since it uses less digits than its factorization.

999143818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499571911.

The product of its digits is 559872, while the sum is 52.

The square root of 999143818 is about 31609.2362767594. The cubic root of 999143818 is about 999.7145245115.

The spelling of 999143818 in words is "nine hundred ninety-nine million, one hundred forty-three thousand, eight hundred eighteen".