805208489 has 4 divisors (see below), whose sum is σ = 820401156. Its totient is φ = 790015824.

The previous prime is 805208483. The next prime is 805208549. The reversal of 805208489 is 984802508.

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 654336400 + 150872089 = 25580^2 + 12283^2 .

It is a cyclic number.

It is not a de Polignac number, because 805208489 - 2²⁸ = 536773033 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (805208483) 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, 7596254 + ... + 7596359.

It is an arithmetic number, because the mean of its divisors is an integer number (205100289).

Almost surely, 2^805208489 is an apocalyptic number.

It is an amenable number.

805208489 is a deficient number, since it is larger than the sum of its proper divisors (15192667).

805208489 is a wasteful number, since it uses less digits than its factorization.

805208489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15192666.

The product of its (nonzero) digits is 184320, while the sum is 44.

The square root of 805208489 is about 28376.1958162119. The cubic root of 805208489 is about 930.3280489905.

The spelling of 805208489 in words is "eight hundred five million, two hundred eight thousand, four hundred eighty-nine".