1818917120 has 144 divisors (see below), whose sum is σ = 4746168000. Its totient is φ = 665247744.

The previous prime is 1818917081. The next prime is 1818917137. The reversal of 1818917120 is 217198181.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 703991 + ... + 706569.

It is an arithmetic number, because the mean of its divisors is an integer number (32959500).

Almost surely, 2^1818917120 is an apocalyptic number.

1818917120 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 1818917120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2373084000).

1818917120 is an abundant number, since it is smaller than the sum of its proper divisors (2927250880).

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

1818917120 is a wasteful number, since it uses less digits than its factorization.

1818917120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2648 (or 2634 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 38.

The square root of 1818917120 is about 42648.7645776522. The cubic root of 1818917120 is about 1220.6869552303.

The spelling of 1818917120 in words is "one billion, eight hundred eighteen million, nine hundred seventeen thousand, one hundred twenty".