819145 has 16 divisors (see below), whose sum is σ = 1088640. Its totient is φ = 588544.

The previous prime is 819131. The next prime is 819149. The reversal of 819145 is 541918.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 819145 - 2⁷ = 819017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1746 + ... + 2164.

It is an arithmetic number, because the mean of its divisors is an integer number (68040).

2⁸¹⁹¹⁴⁵ is an apocalyptic number.

819145 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

819145 is a deficient number, since it is larger than the sum of its proper divisors (269495).

819145 is a wasteful number, since it uses less digits than its factorization.

819145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464.

The product of its digits is 1440, while the sum is 28.

The square root of 819145 is about 905.0662959143. The cubic root of 819145 is about 93.5664735528.

The spelling of 819145 in words is "eight hundred nineteen thousand, one hundred forty-five".