1666260 has 36 divisors (see below), whose sum is σ = 5054868. Its totient is φ = 444288.

The previous prime is 1666237. The next prime is 1666261. The reversal of 1666260 is 626661.

It can be written as a sum of positive squares in 2 ways, for example, as 311364 + 1354896 = 558^2 + 1164^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4449 + ... + 4808.

It is an arithmetic number, because the mean of its divisors is an integer number (140413).

2^1666260 is an apocalyptic number.

1666260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666260 is an abundant number, since it is smaller than the sum of its proper divisors (3388608).

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

1666260 is a wasteful number, since it uses less digits than its factorization.

1666260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9272 (or 9267 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 1666260 is about 1290.8369378043. The cubic root of 1666260 is about 118.5534662323.

The spelling of 1666260 in words is "one million, six hundred sixty-six thousand, two hundred sixty".