660918 has 16 divisors (see below), whose sum is σ = 1344960. Its totient is φ = 216456.

The previous prime is 660917. The next prime is 660923. The reversal of 660918 is 819066.

660918 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660917) 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, 580 + ... + 1287.

It is an arithmetic number, because the mean of its divisors is an integer number (84060).

2⁶⁶⁰⁹¹⁸ is an apocalyptic number.

660918 is an abundant number, since it is smaller than the sum of its proper divisors (684042).

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

660918 is a wasteful number, since it uses less digits than its factorization.

660918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1931.

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

The square root of 660918 is about 812.9686340813. The cubic root of 660918 is about 87.1062251172.

The spelling of 660918 in words is "six hundred sixty thousand, nine hundred eighteen".