1660003 has 4 divisors (see below), whose sum is σ = 1664368. Its totient is φ = 1655640.

The previous prime is 1659997. The next prime is 1660007. The reversal of 1660003 is 3000661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3000661 = 109 ⋅27529.

It is a cyclic number.

It is not a de Polignac number, because 1660003 - 2⁵ = 1659971 is a prime.

It is an Ulam number.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 1551 + ... + 2392.

It is an arithmetic number, because the mean of its divisors is an integer number (416092).

2^1660003 is an apocalyptic number.

1660003 is a deficient number, since it is larger than the sum of its proper divisors (4365).

1660003 is an equidigital number, since it uses as much as digits as its factorization.

1660003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4364.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 1660003 is about 1288.4110368978. The cubic root of 1660003 is about 118.4048860824.

Adding to 1660003 its reverse (3000661), we get a palindrome (4660664).

The spelling of 1660003 in words is "one million, six hundred sixty thousand, three".