999000819 has 12 divisors (see below), whose sum is σ = 1445418000. Its totient is φ = 664885104.

The previous prime is 999000817. The next prime is 999000841. The reversal of 999000819 is 918000999.

It is not a de Polignac number, because 999000819 - 2¹ = 999000817 is a prime.

It is a super-2 number, since 2×999000819² = 1996005272725341522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (999000817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87264 + ... + 98045.

It is an arithmetic number, because the mean of its divisors is an integer number (120451500).

Almost surely, 2^999000819 is an apocalyptic number.

999000819 is a deficient number, since it is larger than the sum of its proper divisors (446417181).

999000819 is a wasteful number, since it uses less digits than its factorization.

999000819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185914 (or 185911 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 999000819 is about 31606.9742145622. The cubic root of 999000819 is about 999.6668286759. Note that the first 3 decimals are identical.

The spelling of 999000819 in words is "nine hundred ninety-nine million, eight hundred nineteen", and thus it is an aban number.