804816409 has 4 divisors (see below), whose sum is σ = 813859380. Its totient is φ = 795773440.

The previous prime is 804816407. The next prime is 804816427. The reversal of 804816409 is 904618408.

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 297666009 + 507150400 = 17253^2 + 22520^2 .

It is a cyclic number.

It is not a de Polignac number, because 804816409 - 2¹ = 804816407 is a prime.

It is a super-3 number, since 3×804816409³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (804816403) 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, 4521352 + ... + 4521529.

It is an arithmetic number, because the mean of its divisors is an integer number (203464845).

Almost surely, 2^804816409 is an apocalyptic number.

804816409 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

It is an amenable number.

804816409 is a deficient number, since it is larger than the sum of its proper divisors (9042971).

804816409 is an equidigital number, since it uses as much as digits as its factorization.

804816409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9042970.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 804816409 is about 28369.2863674785. The cubic root of 804816409 is about 930.1770229945.

The spelling of 804816409 in words is "eight hundred four million, eight hundred sixteen thousand, four hundred nine".