618685 has 4 divisors (see below), whose sum is σ = 742428. Its totient is φ = 494944.

The previous prime is 618679. The next prime is 618703. The reversal of 618685 is 586816.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 427716 + 190969 = 654^2 + 437^2 .

It is a cyclic number.

It is not a de Polignac number, because 618685 - 2⁹ = 618173 is a prime.

It is a super-2 number, since 2×618685² = 765542258450, which contains 22 as substring.

It is a Duffinian number.

618685 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 618685.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 61864 + ... + 61873.

It is an arithmetic number, because the mean of its divisors is an integer number (185607).

2⁶¹⁸⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

618685 is a deficient number, since it is larger than the sum of its proper divisors (123743).

618685 is a wasteful number, since it uses less digits than its factorization.

618685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123742.

The product of its digits is 11520, while the sum is 34.

The square root of 618685 is about 786.5653183303. The cubic root of 618685 is about 85.2098620543.

The spelling of 618685 in words is "six hundred eighteen thousand, six hundred eighty-five".