809780405 has 8 divisors (see below), whose sum is σ = 1110556032. Its totient is φ = 555277968.

The previous prime is 809780393. The next prime is 809780497. The reversal of 809780405 is 504087908.

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

It is not a de Polignac number, because 809780405 - 2⁶ = 809780341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11568257 + ... + 11568326.

It is an arithmetic number, because the mean of its divisors is an integer number (138819504).

Almost surely, 2^809780405 is an apocalyptic number.

It is an amenable number.

809780405 is a deficient number, since it is larger than the sum of its proper divisors (300775627).

809780405 is a wasteful number, since it uses less digits than its factorization.

809780405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23136595.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 809780405 is about 28456.6407891023. The cubic root of 809780405 is about 932.0855055648.

The spelling of 809780405 in words is "eight hundred nine million, seven hundred eighty thousand, four hundred five".