816393 has 4 divisors (see below), whose sum is σ = 1088528. Its totient is φ = 544260.

The previous prime is 816377. The next prime is 816401. The reversal of 816393 is 393618.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 816393 - 2⁴ = 816377 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 816393.

It is not an unprimeable number, because it can be changed into a prime (816353) 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, 136063 + ... + 136068.

It is an arithmetic number, because the mean of its divisors is an integer number (272132).

2⁸¹⁶³⁹³ is an apocalyptic number.

It is an amenable number.

816393 is a deficient number, since it is larger than the sum of its proper divisors (272135).

816393 is a wasteful number, since it uses less digits than its factorization.

816393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272134.

The product of its digits is 3888, while the sum is 30.

The square root of 816393 is about 903.5446862220. The cubic root of 816393 is about 93.4615739992.

It can be divided in two parts, 8163 and 93, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 816393 in words is "eight hundred sixteen thousand, three hundred ninety-three".