816618 has 16 divisors (see below), whose sum is σ = 1781856. Its totient is φ = 247440.

The previous prime is 816593. The next prime is 816649.

816618 is nontrivially palindromic in base 10.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 816618.

It is an unprimeable number.

816618 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 7 ways as a sum of consecutive naturals, for example, 6121 + ... + 6252.

It is an arithmetic number, because the mean of its divisors is an integer number (111366).

2⁸¹⁶⁶¹⁸ is an apocalyptic number.

816618 is an abundant number, since it is smaller than the sum of its proper divisors (965238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

816618 is a wasteful number, since it uses less digits than its factorization.

816618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12389.

The product of its digits is 2304, while the sum is 30.

The square root of 816618 is about 903.6691872583. The cubic root of 816618 is about 93.4701592935.

The spelling of 816618 in words is "eight hundred sixteen thousand, six hundred eighteen".