609986 has 16 divisors (see below), whose sum is σ = 1020600. Its totient is φ = 271488.

The previous prime is 609979. The next prime is 609989. The reversal of 609986 is 689906.

It can be written as a sum of positive squares in 4 ways, for example, as 534361 + 75625 = 731^2 + 275^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 609986.

It is not an unprimeable number, because it can be changed into a prime (609989) by changing a digit.

609986 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350 + ... + 1158.

2⁶⁰⁹⁹⁸⁶ is an apocalyptic number.

609986 is a deficient number, since it is larger than the sum of its proper divisors (410614).

609986 is a wasteful number, since it uses less digits than its factorization.

609986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 609986 is about 781.0160049576. The cubic root of 609986 is about 84.8086120659.

The spelling of 609986 in words is "six hundred nine thousand, nine hundred eighty-six".