618985 has 8 divisors (see below), whose sum is σ = 760320. Its totient is φ = 483504.

The previous prime is 618979. The next prime is 618991. The reversal of 618985 is 589816.

It is an interprime number because it is at equal distance from previous prime (618979) and next prime (618991).

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

It is a cyclic number.

It is not a de Polignac number, because 618985 - 2⁷ = 618857 is a prime.

It is an alternating number because its digits alternate between even and odd.

618985 is a lucky 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 7 ways as a sum of consecutive naturals, for example, 1225 + ... + 1654.

It is an arithmetic number, because the mean of its divisors is an integer number (95040).

2⁶¹⁸⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

618985 is a deficient number, since it is larger than the sum of its proper divisors (141335).

618985 is a wasteful number, since it uses less digits than its factorization.

618985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2927.

The product of its digits is 17280, while the sum is 37.

The square root of 618985 is about 786.7559977528. The cubic root of 618985 is about 85.2236325664.

The spelling of 618985 in words is "six hundred eighteen thousand, nine hundred eighty-five".