1809875172 has 96 divisors (see below), whose sum is σ = 5184256000. Its totient is φ = 489869856.

The previous prime is 1809875113. The next prime is 1809875189. The reversal of 1809875172 is 2715789081.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66633 + ... + 89775.

Almost surely, 2^1809875172 is an apocalyptic number.

1809875172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1809875172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2592128000).

1809875172 is an abundant number, since it is smaller than the sum of its proper divisors (3374380828).

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

1809875172 is a wasteful number, since it uses less digits than its factorization.

1809875172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23190 (or 23174 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 48.

The square root of 1809875172 is about 42542.6277044566. The cubic root of 1809875172 is about 1218.6608911681.

The spelling of 1809875172 in words is "one billion, eight hundred nine million, eight hundred seventy-five thousand, one hundred seventy-two".