999799145 has 8 divisors (see below), whose sum is σ = 1229021640. Its totient is φ = 780330880.

The previous prime is 999799127. The next prime is 999799183. The reversal of 999799145 is 541997999.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 45050944 + 954748201 = 6712^2 + 30899^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 999799145 - 2²⁰ = 998750569 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2438330 + ... + 2438739.

It is an arithmetic number, because the mean of its divisors is an integer number (153627705).

Almost surely, 2^999799145 is an apocalyptic number.

It is an amenable number.

999799145 is a deficient number, since it is larger than the sum of its proper divisors (229222495).

999799145 is a wasteful number, since it uses less digits than its factorization.

999799145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4877115.

The product of its digits is 8266860, while the sum is 62.

The square root of 999799145 is about 31619.6006458020. The cubic root of 999799145 is about 999.9330438503.

The spelling of 999799145 in words is "nine hundred ninety-nine million, seven hundred ninety-nine thousand, one hundred forty-five".