816646 has 8 divisors (see below), whose sum is σ = 1297080. Its totient is φ = 384288.

The previous prime is 816593. The next prime is 816649. The reversal of 816646 is 646618.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816649) by changing a digit.

816646 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11976 + ... + 12043.

It is an arithmetic number, because the mean of its divisors is an integer number (162135).

2⁸¹⁶⁶⁴⁶ is an apocalyptic number.

816646 is a deficient number, since it is larger than the sum of its proper divisors (480434).

816646 is a wasteful number, since it uses less digits than its factorization.

816646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24038.

The product of its digits is 6912, while the sum is 31.

The square root of 816646 is about 903.6846795205. The cubic root of 816646 is about 93.4712275753.

It can be divided in two parts, 81664 and 6, that multiplied together give a palindrome (489984).

The spelling of 816646 in words is "eight hundred sixteen thousand, six hundred forty-six".