797840 has 20 divisors (see below), whose sum is σ = 1855164. Its totient is φ = 319104.

The previous prime is 797833. The next prime is 797851. The reversal of 797840 is 48797.

It can be written as a sum of positive squares in 2 ways, for example, as 183184 + 614656 = 428^2 + 784^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 797840.

It is an unprimeable number.

797840 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 3 ways as a sum of consecutive naturals, for example, 4907 + ... + 5066.

2⁷⁹⁷⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

797840 is an abundant number, since it is smaller than the sum of its proper divisors (1057324).

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

797840 is a wasteful number, since it uses less digits than its factorization.

797840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9986 (or 9980 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 797840 is about 893.2188981431. The cubic root of 797840 is about 92.7481527665.

The spelling of 797840 in words is "seven hundred ninety-seven thousand, eight hundred forty".