1800285840 has 120 divisors (see below), whose sum is σ = 6092431488. Its totient is φ = 476386560.

The previous prime is 1800285811. The next prime is 1800285841. The reversal of 1800285840 is 485820081.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1800285795 and 1800285804.

It is not an unprimeable number, because it can be changed into a prime (1800285841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84777 + ... + 103863.

Almost surely, 2^1800285840 is an apocalyptic number.

1800285840 is a gapful number since it is divisible by the number (10) 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 1800285840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3046215744).

1800285840 is an abundant number, since it is smaller than the sum of its proper divisors (4292145648).

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

1800285840 is a wasteful number, since it uses less digits than its factorization.

1800285840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19237 (or 19228 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 1800285840 is about 42429.7753941734. The cubic root of 1800285840 is about 1216.5047859517.

The spelling of 1800285840 in words is "one billion, eight hundred million, two hundred eighty-five thousand, eight hundred forty".