1806389040 has 80 divisors (see below), whose sum is σ = 5655325536. Its totient is φ = 476928000.

The previous prime is 1806389027. The next prime is 1806389041. The reversal of 1806389040 is 409836081.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 1806389040.

It is not an unprimeable number, because it can be changed into a prime (1806389041) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 13021 + ... + 61500.

Almost surely, 2^1806389040 is an apocalyptic number.

1806389040 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 1806389040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2827662768).

1806389040 is an abundant number, since it is smaller than the sum of its proper divisors (3848936496).

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

1806389040 is a wasteful number, since it uses less digits than its factorization.

1806389040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74638 (or 74632 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 1806389040 is about 42501.6357332280. The cubic root of 1806389040 is about 1217.8779378382.

The spelling of 1806389040 in words is "one billion, eight hundred six million, three hundred eighty-nine thousand, forty".