1809472872 has 16 divisors (see below), whose sum is σ = 4523682240. Its totient is φ = 603157616.

The previous prime is 1809472871. The next prime is 1809472897. The reversal of 1809472872 is 2782749081.

It is not an unprimeable number, because it can be changed into a prime (1809472871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37697328 + ... + 37697375.

It is an arithmetic number, because the mean of its divisors is an integer number (282730140).

Almost surely, 2^1809472872 is an apocalyptic number.

1809472872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1809472872 is an abundant number, since it is smaller than the sum of its proper divisors (2714209368).

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

1809472872 is a wasteful number, since it uses less digits than its factorization.

1809472872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75394712 (or 75394708 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 48.

The square root of 1809472872 is about 42537.8992429104. The cubic root of 1809472872 is about 1218.5705896169.

The spelling of 1809472872 in words is "one billion, eight hundred nine million, four hundred seventy-two thousand, eight hundred seventy-two".