999805045 has 8 divisors (see below), whose sum is σ = 1207408824. Its totient is φ = 794748864.

The previous prime is 999805043. The next prime is 999805057. The reversal of 999805045 is 540508999.

999805045 = 22358² + 22359².

It can be written as a sum of positive squares in 4 ways, for example, as 19989841 + 979815204 = 4471^2 + 31302^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 999805045 - 2¹ = 999805043 is a prime.

It is a super-2 number, since 2×999805045² = 1999220256014904050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 999805045.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999805043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 636034 + ... + 637603.

It is an arithmetic number, because the mean of its divisors is an integer number (150926103).

Almost surely, 2^999805045 is an apocalyptic number.

999805045 is the 22359-th centered square number.

It is an amenable number.

999805045 is a deficient number, since it is larger than the sum of its proper divisors (207603779).

999805045 is a wasteful number, since it uses less digits than its factorization.

999805045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273799.

The product of its (nonzero) digits is 583200, while the sum is 49.

The square root of 999805045 is about 31619.6939422253. The cubic root of 999805045 is about 999.9350107765.

The spelling of 999805045 in words is "nine hundred ninety-nine million, eight hundred five thousand, forty-five".