1666980 has 144 divisors (see below), whose sum is σ = 6115200. Its totient is φ = 381024.

The previous prime is 1666943. The next prime is 1666991. The reversal of 1666980 is 896661.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 238137 + ... + 238143.

2^1666980 is an apocalyptic number.

1666980 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 1666980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3057600).

1666980 is an abundant number, since it is smaller than the sum of its proper divisors (4448220).

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

1666980 is an equidigital number, since it uses as much as digits as its factorization.

1666980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45 (or 17 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 1666980 is about 1291.1157965109. The cubic root of 1666980 is about 118.5705396390.

The spelling of 1666980 in words is "one million, six hundred sixty-six thousand, nine hundred eighty".