1661306 has 8 divisors (see below), whose sum is σ = 2497440. Its totient is φ = 828828.

The previous prime is 1661293. The next prime is 1661311. The reversal of 1661306 is 6031661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1235 + ... + 2201.

It is an arithmetic number, because the mean of its divisors is an integer number (312180).

2^1661306 is an apocalyptic number.

1661306 is a deficient number, since it is larger than the sum of its proper divisors (836134).

1661306 is an equidigital number, since it uses as much as digits as its factorization.

1661306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1828.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 1661306 is about 1288.9165993190. The cubic root of 1661306 is about 118.4358581584.

Adding to 1661306 its reverse (6031661), we get a palindrome (7692967).

The spelling of 1661306 in words is "one million, six hundred sixty-one thousand, three hundred six".