819385 has 16 divisors (see below), whose sum is σ = 1153152. Its totient is φ = 547200.

The previous prime is 819373. The next prime is 819389. The reversal of 819385 is 583918.

It is not a de Polignac number, because 819385 - 2¹¹ = 817337 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 819385.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819389) 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, 1150 + ... + 1720.

It is an arithmetic number, because the mean of its divisors is an integer number (72072).

2⁸¹⁹³⁸⁵ is an apocalyptic number.

It is an amenable number.

819385 is a deficient number, since it is larger than the sum of its proper divisors (333767).

819385 is a wasteful number, since it uses less digits than its factorization.

819385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624.

The product of its digits is 8640, while the sum is 34.

The square root of 819385 is about 905.1988731765. The cubic root of 819385 is about 93.5756106250.

The spelling of 819385 in words is "eight hundred nineteen thousand, three hundred eighty-five".