985669 has 4 divisors (see below), whose sum is σ = 987660. Its totient is φ = 983680.

The previous prime is 985667. The next prime is 985679. The reversal of 985669 is 966589.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 966589 = 13 ⋅74353.

It can be written as a sum of positive squares in 2 ways, for example, as 263169 + 722500 = 513^2 + 850^2 .

It is a cyclic number.

It is not a de Polignac number, because 985669 - 2¹ = 985667 is a prime.

It is a super-2 number, since 2×985669² = 1943086755122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (985667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399 + ... + 1459.

It is an arithmetic number, because the mean of its divisors is an integer number (246915).

2⁹⁸⁵⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

985669 is a deficient number, since it is larger than the sum of its proper divisors (1991).

985669 is a wasteful number, since it uses less digits than its factorization.

985669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1990.

The product of its digits is 116640, while the sum is 43.

The square root of 985669 is about 992.8086421864. The cubic root of 985669 is about 99.5199996834.

The spelling of 985669 in words is "nine hundred eighty-five thousand, six hundred sixty-nine".