1609949604 has 12 divisors (see below), whose sum is σ = 3756549104. Its totient is φ = 536649864.

The previous prime is 1609949557. The next prime is 1609949647. The reversal of 1609949604 is 4069499061.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67081222 + ... + 67081245.

Almost surely, 2^1609949604 is an apocalyptic number.

It is an amenable number.

1609949604 is an abundant number, since it is smaller than the sum of its proper divisors (2146599500).

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

1609949604 is a wasteful number, since it uses less digits than its factorization.

1609949604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134162474 (or 134162472 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 48.

The square root of 1609949604 is about 40124.1772999771. The cubic root of 1609949604 is about 1172.0264887411.

It can be divided in two parts, 16099 and 49604, that added together give a triangular number (65703 = T₃₆₂).

The spelling of 1609949604 in words is "one billion, six hundred nine million, nine hundred forty-nine thousand, six hundred four".