618686 has 8 divisors (see below), whose sum is σ = 960120. Its totient is φ = 298648.

The previous prime is 618679. The next prime is 618703. The reversal of 618686 is 686816.

618686 is nontrivially palindromic in base 7.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

618686 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 in 3 ways as a sum of consecutive naturals, for example, 5276 + ... + 5391.

It is an arithmetic number, because the mean of its divisors is an integer number (120015).

2⁶¹⁸⁶⁸⁶ is an apocalyptic number.

618686 is a deficient number, since it is larger than the sum of its proper divisors (341434).

618686 is a wasteful number, since it uses less digits than its factorization.

618686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10698.

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

The square root of 618686 is about 786.5659540051. The cubic root of 618686 is about 85.2099079634.

It can be divided in two parts, 6186 and 86, that multiplied together give a triangular number (531996 = T₁₀₃₁).

The spelling of 618686 in words is "six hundred eighteen thousand, six hundred eighty-six".