1660013 has 4 divisors (see below), whose sum is σ = 1691388. Its totient is φ = 1628640.

The previous prime is 1660007. The next prime is 1660037. The reversal of 1660013 is 3100661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1054729 + 605284 = 1027^2 + 778^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660013 - 2⁴ = 1659997 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1659973 and 1660000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660063) 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 3 ways as a sum of consecutive naturals, for example, 15608 + ... + 15713.

It is an arithmetic number, because the mean of its divisors is an integer number (422847).

2^1660013 is an apocalyptic number.

It is an amenable number.

1660013 is a deficient number, since it is larger than the sum of its proper divisors (31375).

1660013 is an equidigital number, since it uses as much as digits as its factorization.

1660013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31374.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1660013 is about 1288.4149176411. The cubic root of 1660013 is about 118.4051238424.

Adding to 1660013 its reverse (3100661), we get a palindrome (4760674).

The spelling of 1660013 in words is "one million, six hundred sixty thousand, thirteen".