816189 has 8 divisors (see below), whose sum is σ = 1187232. Its totient is φ = 494640.

The previous prime is 816169. The next prime is 816191. The reversal of 816189 is 981618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 816189 - 2⁵ = 816157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 24733 = 816189 / (8 + 1 + 6 + 1 + 8 + 9).

It is an alternating number because its digits alternate between even and odd.

816189 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12334 + ... + 12399.

It is an arithmetic number, because the mean of its divisors is an integer number (148404).

2⁸¹⁶¹⁸⁹ is an apocalyptic number.

It is an amenable number.

816189 is a deficient number, since it is larger than the sum of its proper divisors (371043).

816189 is a wasteful number, since it uses less digits than its factorization.

816189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24747.

The product of its digits is 3456, while the sum is 33.

The square root of 816189 is about 903.4317904524. The cubic root of 816189 is about 93.4537886354.

The spelling of 816189 in words is "eight hundred sixteen thousand, one hundred eighty-nine".