791820 has 72 divisors (see below), whose sum is σ = 2476656. Its totient is φ = 204672.

The previous prime is 791803. The next prime is 791827. The reversal of 791820 is 28197.

It is not an unprimeable number, because it can be changed into a prime (791827) by changing a digit.

791820 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9499 + ... + 9581.

It is an arithmetic number, because the mean of its divisors is an integer number (34398).

2⁷⁹¹⁸²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 791820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1238328).

791820 is an abundant number, since it is smaller than the sum of its proper divisors (1684836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

791820 is a wasteful number, since it uses less digits than its factorization.

791820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 146 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 791820 is about 889.8426827254. The cubic root of 791820 is about 92.5142904632.

The spelling of 791820 in words is "seven hundred ninety-one thousand, eight hundred twenty".