816693 has 4 divisors (see below), whose sum is σ = 1088928. Its totient is φ = 544460.

The previous prime is 816691. The next prime is 816703. The reversal of 816693 is 396618.

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 a cyclic number.

It is not a de Polignac number, because 816693 - 2¹ = 816691 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816691) 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 3 ways as a sum of consecutive naturals, for example, 136113 + ... + 136118.

It is an arithmetic number, because the mean of its divisors is an integer number (272232).

2⁸¹⁶⁶⁹³ is an apocalyptic number.

It is an amenable number.

816693 is a deficient number, since it is larger than the sum of its proper divisors (272235).

816693 is a wasteful number, since it uses less digits than its factorization.

816693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272234.

The product of its digits is 7776, while the sum is 33.

The square root of 816693 is about 903.7106837921. The cubic root of 816693 is about 93.4730207078.

The spelling of 816693 in words is "eight hundred sixteen thousand, six hundred ninety-three".