819798 has 32 divisors (see below), whose sum is σ = 1900800. Its totient is φ = 230880.

The previous prime is 819787. The next prime is 819799. The reversal of 819798 is 897918.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an Ulam number.

It is a Curzon 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 15 ways as a sum of consecutive naturals, for example, 5428 + ... + 5576.

It is an arithmetic number, because the mean of its divisors is an integer number (59400).

2⁸¹⁹⁷⁹⁸ is an apocalyptic number.

819798 is an abundant number, since it is smaller than the sum of its proper divisors (1081002).

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

819798 is a wasteful number, since it uses less digits than its factorization.

819798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292.

The product of its digits is 36288, while the sum is 42.

The square root of 819798 is about 905.4269711026. The cubic root of 819798 is about 93.5913298273.

Adding to 819798 its sum of digits (42), we get a triangular number (819840 = T₁₂₈₀).

Adding to 819798 its product of digits (36288), we get a triangular number (856086 = T₁₃₀₈).

The spelling of 819798 in words is "eight hundred nineteen thousand, seven hundred ninety-eight".