806143409 has 4 divisors (see below), whose sum is σ = 821353716. Its totient is φ = 790933104.

The previous prime is 806143369. The next prime is 806143423. The reversal of 806143409 is 904341608.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 400000000 + 406143409 = 20000^2 + 20153^2 .

It is a cyclic number.

It is not a de Polignac number, because 806143409 - 2²⁰ = 805094833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (806142409) 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, 7605074 + ... + 7605179.

It is an arithmetic number, because the mean of its divisors is an integer number (205338429).

Almost surely, 2^806143409 is an apocalyptic number.

It is an amenable number.

806143409 is a deficient number, since it is larger than the sum of its proper divisors (15210307).

806143409 is a wasteful number, since it uses less digits than its factorization.

806143409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15210306.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 806143409 is about 28392.6647041098. The cubic root of 806143409 is about 930.6879747722.

The spelling of 806143409 in words is "eight hundred six million, one hundred forty-three thousand, four hundred nine".