618866 has 4 divisors (see below), whose sum is σ = 928302. Its totient is φ = 309432.

The previous prime is 618859. The next prime is 618869. The reversal of 618866 is 668816.

618866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 570025 + 48841 = 755^2 + 221^2 .

It is not an unprimeable number, because it can be changed into a prime (618869) by changing a digit.

618866 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, 154715 + ... + 154718.

2⁶¹⁸⁸⁶⁶ is an apocalyptic number.

618866 is a deficient number, since it is larger than the sum of its proper divisors (309436).

618866 is a wasteful number, since it uses less digits than its factorization.

618866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309435.

The product of its digits is 13824, while the sum is 35.

The square root of 618866 is about 786.6803671123. The cubic root of 618866 is about 85.2181707958.

The spelling of 618866 in words is "six hundred eighteen thousand, eight hundred sixty-six".