1820025000 has 144 divisors (see below), whose sum is σ = 6161910300. Its totient is φ = 485280000.

The previous prime is 1820024963. The next prime is 1820025001. The reversal of 1820025000 is 5200281.

It can be written as a sum of positive squares in 6 ways, for example, as 741690756 + 1078334244 = 27234^2 + 32838^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1820025001) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 220956 + ... + 229044.

Almost surely, 2^1820025000 is an apocalyptic number.

1820025000 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 1820025000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3080955150).

1820025000 is an abundant number, since it is smaller than the sum of its proper divisors (4341885300).

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

1820025000 is an equidigital number, since it uses as much as digits as its factorization.

1820025000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8126 (or 8099 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 1820025000 is about 42661.7510189162. The cubic root of 1820025000 is about 1220.9347400561.

Adding to 1820025000 its reverse (5200281), we get a palindrome (1825225281).

The spelling of 1820025000 in words is "one billion, eight hundred twenty million, twenty-five thousand".