1661304 has 16 divisors (see below), whose sum is σ = 4153320. Its totient is φ = 553760.

The previous prime is 1661293. The next prime is 1661311. The reversal of 1661304 is 4031661.

It is a congruent number.

It is an unprimeable number.

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, 34587 + ... + 34634.

2^1661304 is an apocalyptic number.

It is an amenable number.

1661304 is an abundant number, since it is smaller than the sum of its proper divisors (2492016).

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

1661304 is a wasteful number, since it uses less digits than its factorization.

1661304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69230 (or 69226 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1661304 is about 1288.9158234734. The cubic root of 1661304 is about 118.4358106312.

Adding to 1661304 its reverse (4031661), we get a palindrome (5692965).

The spelling of 1661304 in words is "one million, six hundred sixty-one thousand, three hundred four".