1666760 has 16 divisors (see below), whose sum is σ = 3750300. Its totient is φ = 666688.

The previous prime is 1666757. The next prime is 1666771. The reversal of 1666760 is 676661.

It can be written as a sum of positive squares in 2 ways, for example, as 1552516 + 114244 = 1246^2 + 338^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 20795 + ... + 20874.

2^1666760 is an apocalyptic number.

1666760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666760 is an abundant number, since it is smaller than the sum of its proper divisors (2083540).

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

1666760 is a wasteful number, since it uses less digits than its factorization.

1666760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41680 (or 41676 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 1666760 is about 1291.0305960743. The cubic root of 1666760 is about 118.5653232864.

Subtracting from 1666760 its reverse (676661), we obtain a palindrome (990099).

The spelling of 1666760 in words is "one million, six hundred sixty-six thousand, seven hundred sixty".