1818494720 has 144 divisors (see below), whose sum is σ = 5139499008. Its totient is φ = 603279360.

The previous prime is 1818494707. The next prime is 1818494737. The reversal of 1818494720 is 274948181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274487 + ... + 281033.

Almost surely, 2^1818494720 is an apocalyptic number.

1818494720 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 1818494720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2569749504).

1818494720 is an abundant number, since it is smaller than the sum of its proper divisors (3321004288).

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

1818494720 is an equidigital number, since it uses as much as digits as its factorization.

1818494720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6606 (or 6592 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 44.

The square root of 1818494720 is about 42643.8122123245. The cubic root of 1818494720 is about 1220.5924561311.

The spelling of 1818494720 in words is "one billion, eight hundred eighteen million, four hundred ninety-four thousand, seven hundred twenty".