617985 has 24 divisors (see below), whose sum is σ = 1108224. Its totient is φ = 318240.

The previous prime is 617983. The next prime is 618029. The reversal of 617985 is 589716.

It is not a de Polignac number, because 617985 - 2¹ = 617983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (617983) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1174 + ... + 1616.

It is an arithmetic number, because the mean of its divisors is an integer number (46176).

2⁶¹⁷⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

617985 is a deficient number, since it is larger than the sum of its proper divisors (490239).

617985 is a wasteful number, since it uses less digits than its factorization.

617985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485 (or 482 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 617985 is about 786.1202198137. The cubic root of 617985 is about 85.1777135387.

The spelling of 617985 in words is "six hundred seventeen thousand, nine hundred eighty-five".