816243 has 8 divisors (see below), whose sum is σ = 1095888. Its totient is φ = 540384.

The previous prime is 816239. The next prime is 816251. The reversal of 816243 is 342618.

It is a happy number.

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

It is not a de Polignac number, because 816243 - 2² = 816239 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (816203) 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, 396 + ... + 1337.

It is an arithmetic number, because the mean of its divisors is an integer number (136986).

2⁸¹⁶²⁴³ is an apocalyptic number.

816243 is a deficient number, since it is larger than the sum of its proper divisors (279645).

816243 is a wasteful number, since it uses less digits than its factorization.

816243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1893.

The product of its digits is 1152, while the sum is 24.

The square root of 816243 is about 903.4616759996. The cubic root of 816243 is about 93.4558495932.

The spelling of 816243 in words is "eight hundred sixteen thousand, two hundred forty-three".