806618 has 4 divisors (see below), whose sum is σ = 1209930. Its totient is φ = 403308.

The previous prime is 806609. The next prime is 806639. The reversal of 806618 is 816608.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 667489 + 139129 = 817^2 + 373^2 .

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 as a sum of consecutive naturals, namely, 201653 + ... + 201656.

2⁸⁰⁶⁶¹⁸ is an apocalyptic number.

806618 is a deficient number, since it is larger than the sum of its proper divisors (403312).

806618 is a wasteful number, since it uses less digits than its factorization.

806618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403311.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 806618 is about 898.1191457708. The cubic root of 806618 is about 93.0870576479.

The spelling of 806618 in words is "eight hundred six thousand, six hundred eighteen".