981660 has 24 divisors (see below), whose sum is σ = 2748816. Its totient is φ = 261760.

The previous prime is 981653. The next prime is 981683. The reversal of 981660 is 66189.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8121 + ... + 8240.

It is an arithmetic number, because the mean of its divisors is an integer number (114534).

2⁹⁸¹⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

981660 is an abundant number, since it is smaller than the sum of its proper divisors (1767156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

981660 is a wasteful number, since it uses less digits than its factorization.

981660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16373 (or 16371 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 981660 is about 990.7875655255. The cubic root of 981660 is about 99.3848908315.

The spelling of 981660 in words is "nine hundred eighty-one thousand, six hundred sixty".