1805000000 has 168 divisors, whose sum is σ = 4725280872. Its totient is φ = 684000000.

The previous prime is 1804999969. The next prime is 1805000051. The reversal of 1805000000 is 5081.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 4 ways, for example, as 1785569536 + 19430464 = 42256^2 + 4408^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94999991 + ... + 95000009.

Almost surely, 2^1805000000 is an apocalyptic number.

1805000000 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 1805000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2362640436).

1805000000 is an abundant number, since it is smaller than the sum of its proper divisors (2920280872).

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

1805000000 is an frugal number, since it uses more digits than its factorization.

1805000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85 (or 26 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 1805000000 is about 42485.2915724960. The cubic root of 1805000000 is about 1217.5656915224.

Adding to 1805000000 its reverse (5081), we get a palindrome (1805005081).

It can be divided in two parts, 180 and 5000000, that multiplied together give a square (900000000 = 30000²).

The spelling of 1805000000 in words is "one billion, eight hundred five million", and thus it is an aban number.