660940 has 24 divisors (see below), whose sum is σ = 1586592. Its totient is φ = 226560.

The previous prime is 660923. The next prime is 660941. The reversal of 660940 is 49066.

It is not an unprimeable number, because it can be changed into a prime (660941) 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, 2221 + ... + 2500.

It is an arithmetic number, because the mean of its divisors is an integer number (66108).

2⁶⁶⁰⁹⁴⁰ is an apocalyptic number.

It is an amenable number.

660940 is an abundant number, since it is smaller than the sum of its proper divisors (925652).

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

660940 is a wasteful number, since it uses less digits than its factorization.

660940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4737 (or 4735 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 660940 is about 812.9821646260. The cubic root of 660940 is about 87.1071916091.

It can be divided in two parts, 660 and 940, that added together give a square (1600 = 40²).

The spelling of 660940 in words is "six hundred sixty thousand, nine hundred forty".