1043806805 has 4 divisors (see below), whose sum is σ = 1252568172. Its totient is φ = 835045440.

The previous prime is 1043806801. The next prime is 1043806837. The reversal of 1043806805 is 5086083401.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5086083401 = 7 ⋅726583343.

It can be written as a sum of positive squares in 2 ways, for example, as 580954609 + 462852196 = 24103^2 + 21514^2 .

It is not a de Polignac number, because 1043806805 - 2² = 1043806801 is a prime.

It is a super-3 number, since 3×1043806805³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1043806801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104380676 + ... + 104380685.

It is an arithmetic number, because the mean of its divisors is an integer number (313142043).

Almost surely, 2^1043806805 is an apocalyptic number.

It is an amenable number.

1043806805 is a deficient number, since it is larger than the sum of its proper divisors (208761367).

1043806805 is an equidigital number, since it uses as much as digits as its factorization.

1043806805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208761366.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 1043806805 is about 32307.9990869134. Note that the first 3 decimals coincide. The cubic root of 1043806805 is about 1014.3940845611.

The spelling of 1043806805 in words is "one billion, forty-three million, eight hundred six thousand, eight hundred five".