816433 has 4 divisors (see below), whose sum is σ = 836388. Its totient is φ = 796480.

The previous prime is 816427. The next prime is 816443. The reversal of 816433 is 334618.

816433 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 334618 = 2 ⋅167309.

It can be written as a sum of positive squares in 2 ways, for example, as 27889 + 788544 = 167^2 + 888^2 .

It is a cyclic number.

It is not a de Polignac number, because 816433 - 2⁵ = 816401 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 816398 and 816407.

It is not an unprimeable number, because it can be changed into a prime (816443) 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, 9916 + ... + 9997.

It is an arithmetic number, because the mean of its divisors is an integer number (209097).

2⁸¹⁶⁴³³ is an apocalyptic number.

It is an amenable number.

816433 is a deficient number, since it is larger than the sum of its proper divisors (19955).

816433 is a wasteful number, since it uses less digits than its factorization.

816433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19954.

The product of its digits is 1728, while the sum is 25.

The square root of 816433 is about 903.5668209933. The cubic root of 816433 is about 93.4631003890.

The spelling of 816433 in words is "eight hundred sixteen thousand, four hundred thirty-three".