1681660 has 24 divisors (see below), whose sum is σ = 3608640. Its totient is φ = 657984.

The previous prime is 1681651. The next prime is 1681661. The reversal of 1681660 is 661861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46 + ... + 1834.

It is an arithmetic number, because the mean of its divisors is an integer number (150360).

2^1681660 is an apocalyptic number.

1681660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1681660 is an abundant number, since it is smaller than the sum of its proper divisors (1926980).

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

1681660 is a wasteful number, since it uses less digits than its factorization.

1681660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1845 (or 1843 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1681660 is about 1296.7883404781. The cubic root of 1681660 is about 118.9175805728.

The spelling of 1681660 in words is "one million, six hundred eighty-one thousand, six hundred sixty".