1660240 has 20 divisors (see below), whose sum is σ = 3860244. Its totient is φ = 664064.

The previous prime is 1660231. The next prime is 1660247. The reversal of 1660240 is 420661.

It can be written as a sum of positive squares in 2 ways, for example, as 553536 + 1106704 = 744^2 + 1052^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660247) 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, 10297 + ... + 10456.

2^1660240 is an apocalyptic number.

1660240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1660240 is an abundant number, since it is smaller than the sum of its proper divisors (2200004).

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

1660240 is a wasteful number, since it uses less digits than its factorization.

1660240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20766 (or 20760 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1660240 is about 1288.5030073694. The cubic root of 1660240 is about 118.4105207354.

The spelling of 1660240 in words is "one million, six hundred sixty thousand, two hundred forty".