1666480 has 40 divisors (see below), whose sum is σ = 3986352. Its totient is φ = 647424.

The previous prime is 1666477. The next prime is 1666481. The reversal of 1666480 is 846661.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1666481) 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 7 ways as a sum of consecutive naturals, for example, 2679 + ... + 3241.

2^1666480 is an apocalyptic number.

1666480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1993176).

1666480 is an abundant number, since it is smaller than the sum of its proper divisors (2319872).

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

1666480 is a wasteful number, since it uses less digits than its factorization.

1666480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613 (or 607 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 1666480 is about 1290.9221510223. The cubic root of 1666480 is about 118.5586836283.

The spelling of 1666480 in words is "one million, six hundred sixty-six thousand, four hundred eighty".