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1818000000 = 273256101
BaseRepresentation
bin110110001011100…
…0111101010000000
311200200212222011100
41230113013222000
512210402000000
6500222014400
763023513355
oct15427075200
94620788140
101818000000
11853239343
12428a17400
1322c85305b
1413364062c
15a9911a00
hex6c5c7a80

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, 21818000000 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.