1800044172 has 18 divisors (see below), whose sum is σ = 4550111748. Its totient is φ = 600014712.

The previous prime is 1800044153. The next prime is 1800044189. The reversal of 1800044172 is 2714400081.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 25000578 + ... + 25000649.

It is an arithmetic number, because the mean of its divisors is an integer number (252783986).

Almost surely, 2^1800044172 is an apocalyptic number.

1800044172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1800044172 is an abundant number, since it is smaller than the sum of its proper divisors (2750067576).

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

1800044172 is a wasteful number, since it uses less digits than its factorization.

1800044172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50001237 (or 50001232 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 1800044172 is about 42426.9274400115. The cubic root of 1800044172 is about 1216.4503495158.

The spelling of 1800044172 in words is "one billion, eight hundred million, forty-four thousand, one hundred seventy-two".