1609786920 has 64 divisors (see below), whose sum is σ = 5519272320. Its totient is φ = 367951104.

The previous prime is 1609786907. The next prime is 1609786921. The reversal of 1609786920 is 296879061.

It is a self number, because there is not a number n which added to its sum of digits gives 1609786920.

It is not an unprimeable number, because it can be changed into a prime (1609786921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 957367 + ... + 959046.

It is an arithmetic number, because the mean of its divisors is an integer number (86238630).

Almost surely, 2^1609786920 is an apocalyptic number.

1609786920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1609786920 is an abundant number, since it is smaller than the sum of its proper divisors (3909485400).

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

1609786920 is a wasteful number, since it uses less digits than its factorization.

1609786920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1916434 (or 1916430 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 1609786920 is about 40122.1499922424. The cubic root of 1609786920 is about 1171.9870099940.

The spelling of 1609786920 in words is "one billion, six hundred nine million, seven hundred eighty-six thousand, nine hundred twenty".