820408793 has 8 divisors (see below), whose sum is σ = 825588000. Its totient is φ = 815246208.

The previous prime is 820408789. The next prime is 820408817. The reversal of 820408793 is 397804028.

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

It is a cyclic number.

It is not a de Polignac number, because 820408793 - 2² = 820408789 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 820408793.

It is not an unprimeable number, because it can be changed into a prime (820408993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103433 + ... + 111081.

It is an arithmetic number, because the mean of its divisors is an integer number (103198500).

Almost surely, 2^820408793 is an apocalyptic number.

It is an amenable number.

820408793 is a deficient number, since it is larger than the sum of its proper divisors (5179207).

820408793 is a wasteful number, since it uses less digits than its factorization.

820408793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8311.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 820408793 is about 28642.7790725691. The cubic root of 820408793 is about 936.1456755908.

The spelling of 820408793 in words is "eight hundred twenty million, four hundred eight thousand, seven hundred ninety-three".