1660000 has 60 divisors (see below), whose sum is σ = 4133052. Its totient is φ = 656000.

The previous prime is 1659997. The next prime is 1660007. The reversal of 1660000 is 661.

It is a nialpdrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660007) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 19959 + ... + 20041.

2^1660000 is an apocalyptic number.

1660000 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 1660000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2066526).

1660000 is an abundant number, since it is smaller than the sum of its proper divisors (2473052).

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

1660000 is an frugal number, since it uses more digits than its factorization.

1660000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1660000 is about 1288.4098726725. The cubic root of 1660000 is about 118.4048147543.

Adding to 1660000 its reverse (661), we get a palindrome (1660661).

The spelling of 1660000 in words is "one million, six hundred sixty thousand".