812618 has 4 divisors (see below), whose sum is σ = 1218930. Its totient is φ = 406308.

The previous prime is 812599. The next prime is 812627. The reversal of 812618 is 816218.

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., 528529 + 284089 = 727^2 + 533^2 .

It is an unprimeable number.

812618 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 as a sum of consecutive naturals, namely, 203153 + ... + 203156.

2⁸¹²⁶¹⁸ is an apocalyptic number.

812618 is a deficient number, since it is larger than the sum of its proper divisors (406312).

812618 is a wasteful number, since it uses less digits than its factorization.

812618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406311.

The product of its digits is 768, while the sum is 26.

The square root of 812618 is about 901.4532711128. The cubic root of 812618 is about 93.3172959973.

Subtracting 812618 from its reverse (816218), we obtain a square (3600 = 60²).

The spelling of 812618 in words is "eight hundred twelve thousand, six hundred eighteen".