819797 has 4 divisors (see below), whose sum is σ = 894336. Its totient is φ = 745260.

The previous prime is 819787. The next prime is 819799. The reversal of 819797 is 797918.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 819797 - 2⁴ = 819781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819799) 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, 37253 + ... + 37274.

It is an arithmetic number, because the mean of its divisors is an integer number (223584).

2⁸¹⁹⁷⁹⁷ is an apocalyptic number.

It is an amenable number.

819797 is a deficient number, since it is larger than the sum of its proper divisors (74539).

819797 is a wasteful number, since it uses less digits than its factorization.

819797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74538.

The product of its digits is 31752, while the sum is 41.

The square root of 819797 is about 905.4264188768. The cubic root of 819797 is about 93.5912917727.

The spelling of 819797 in words is "eight hundred nineteen thousand, seven hundred ninety-seven".