1609644 has 24 divisors (see below), whose sum is σ = 3877888. Its totient is φ = 519120.

The previous prime is 1609631. The next prime is 1609667. The reversal of 1609644 is 4469061.

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 7 ways as a sum of consecutive naturals, for example, 1792 + ... + 2535.

2^1609644 is an apocalyptic number.

It is an amenable number.

1609644 is an abundant number, since it is smaller than the sum of its proper divisors (2268244).

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

1609644 is a wasteful number, since it uses less digits than its factorization.

1609644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4365 (or 4363 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 1609644 is about 1268.7174626370. The cubic root of 1609644 is about 117.1952325209.

The spelling of 1609644 in words is "one million, six hundred nine thousand, six hundred forty-four".