1648609 has 8 divisors (see below), whose sum is σ = 1793448. Its totient is φ = 1509120.

The previous prime is 1648601. The next prime is 1648613. The reversal of 1648609 is 9068461.

It can be written as a sum of positive squares in 4 ways, for example, as 1081600 + 567009 = 1040^2 + 753^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1648609 - 2³ = 1648601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1648601) 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 7 ways as a sum of consecutive naturals, for example, 682 + ... + 1939.

It is an arithmetic number, because the mean of its divisors is an integer number (224181).

2^1648609 is an apocalyptic number.

It is an amenable number.

1648609 is a deficient number, since it is larger than the sum of its proper divisors (144839).

1648609 is a wasteful number, since it uses less digits than its factorization.

1648609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2675.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 1648609 is about 1283.9816976889. The cubic root of 1648609 is about 118.1333597100.

The spelling of 1648609 in words is "one million, six hundred forty-eight thousand, six hundred nine".