816485 has 8 divisors (see below), whose sum is σ = 996216. Its totient is φ = 642240.

The previous prime is 816469. The next prime is 816499. The reversal of 816485 is 584618.

It can be written as a sum of positive squares in 4 ways, for example, as 73441 + 743044 = 271^2 + 862^2 .

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

It is not a de Polignac number, because 816485 - 2⁴ = 816469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 1034 + ... + 1643.

It is an arithmetic number, because the mean of its divisors is an integer number (124527).

2⁸¹⁶⁴⁸⁵ is an apocalyptic number.

It is an amenable number.

816485 is a deficient number, since it is larger than the sum of its proper divisors (179731).

816485 is a wasteful number, since it uses less digits than its factorization.

816485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2743.

The product of its digits is 7680, while the sum is 32.

The square root of 816485 is about 903.5955953855. The cubic root of 816485 is about 93.4650846212.

The spelling of 816485 in words is "eight hundred sixteen thousand, four hundred eighty-five".