1800009432 has 128 divisors (see below), whose sum is σ = 5434968000. Its totient is φ = 548674560.

The previous prime is 1800009427. The next prime is 1800009457. The reversal of 1800009432 is 2349000081.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1800009396 and 1800009405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 303132 + ... + 309012.

Almost surely, 2^1800009432 is an apocalyptic number.

1800009432 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 1800009432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2717484000).

1800009432 is an abundant number, since it is smaller than the sum of its proper divisors (3634958568).

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

1800009432 is a wasteful number, since it uses less digits than its factorization.

1800009432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6018 (or 6008 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1800009432 is about 42426.5180282332. The cubic root of 1800009432 is about 1216.4425238269.

The spelling of 1800009432 in words is "one billion, eight hundred million, nine thousand, four hundred thirty-two".