1721085872 has 20 divisors (see below), whose sum is σ = 3637750056. Its totient is φ = 782311680.

The previous prime is 1721085871. The next prime is 1721085893. The reversal of 1721085872 is 2785801271.

It is not an unprimeable number, because it can be changed into a prime (1721085871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4889273 + ... + 4889624.

Almost surely, 2^1721085872 is an apocalyptic number.

It is an amenable number.

1721085872 is an abundant number, since it is smaller than the sum of its proper divisors (1916664184).

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

1721085872 is a wasteful number, since it uses less digits than its factorization.

1721085872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9778916 (or 9778910 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 41.

The square root of 1721085872 is about 41485.9719905416. The cubic root of 1721085872 is about 1198.3973680025.

The spelling of 1721085872 in words is "one billion, seven hundred twenty-one million, eighty-five thousand, eight hundred seventy-two".