655985 has 8 divisors (see below), whose sum is σ = 858816. Its totient is φ = 477040.

The previous prime is 655961. The next prime is 655987. The reversal of 655985 is 589556.

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

It is not a de Polignac number, because 655985 - 2¹⁴ = 639601 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 655985.

It is not an unprimeable number, because it can be changed into a prime (655987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5909 + ... + 6018.

It is an arithmetic number, because the mean of its divisors is an integer number (107352).

2⁶⁵⁵⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

655985 is a deficient number, since it is larger than the sum of its proper divisors (202831).

655985 is a wasteful number, since it uses less digits than its factorization.

655985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11943.

The product of its digits is 54000, while the sum is 38.

The square root of 655985 is about 809.9290092348. The cubic root of 655985 is about 86.8889674418. Note that the first 3 decimals are identical.

The spelling of 655985 in words is "six hundred fifty-five thousand, nine hundred eighty-five".