1818199728 has 30 divisors (see below), whose sum is σ = 5088434364. Its totient is φ = 606066528.

The previous prime is 1818199727. The next prime is 1818199739. The reversal of 1818199728 is 8279918181.

1818199728 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1818199723) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6313050 + ... + 6313337.

Almost surely, 2^1818199728 is an apocalyptic number.

1818199728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1818199728 is an abundant number, since it is smaller than the sum of its proper divisors (3270234636).

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

1818199728 is a wasteful number, since it uses less digits than its factorization.

1818199728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12626401 (or 12626392 counting only the distinct ones).

The product of its digits is 580608, while the sum is 54.

The square root of 1818199728 is about 42640.3532818386. The cubic root of 1818199728 is about 1220.5264520019.

The spelling of 1818199728 in words is "one billion, eight hundred eighteen million, one hundred ninety-nine thousand, seven hundred twenty-eight".