981985 has 8 divisors (see below), whose sum is σ = 1229760. Its totient is φ = 751344.

The previous prime is 981983. The next prime is 982021. The reversal of 981985 is 589189.

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 981985 - 2¹ = 981983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (981983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4155 + ... + 4384.

It is an arithmetic number, because the mean of its divisors is an integer number (153720).

2⁹⁸¹⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

981985 is a deficient number, since it is larger than the sum of its proper divisors (247775).

981985 is a wasteful number, since it uses less digits than its factorization.

981985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8567.

The product of its digits is 25920, while the sum is 40.

The square root of 981985 is about 990.9515628930. The cubic root of 981985 is about 99.3958574682.

The spelling of 981985 in words is "nine hundred eighty-one thousand, nine hundred eighty-five".