1818000000 has 336 divisors, whose sum is σ = 6604017030. Its totient is φ = 480000000.

The previous prime is 1817999999. The next prime is 1818000007. The reversal of 1818000000 is 8181.

It is a happy number.

It can be written as a sum of positive squares in 7 ways, for example, as 457275456 + 1360724544 = 21384^2 + 36888^2 .

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 (1818000007) by changing a digit.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 17999950 + ... + 18000050.

Almost surely, 2^1818000000 is an apocalyptic number.

1818000000 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 1818000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3302008515).

1818000000 is an abundant number, since it is smaller than the sum of its proper divisors (4786017030).

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

1818000000 is an frugal number, since it uses more digits than its factorization.

1818000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 1818000000 is about 42638.0112106557. The cubic root of 1818000000 is about 1220.4817590326.

Adding to 1818000000 its reverse (8181), we get a palindrome (1818008181).

It can be divided in two parts, 18 and 18000000, that multiplied together give a square (324000000 = 18000²).

The spelling of 1818000000 in words is "one billion, eight hundred eighteen million", and thus it is an aban number.