1819998180 has 864 divisors, whose sum is σ = 7990980480. Its totient is φ = 339655680.

The previous prime is 1819998161. The next prime is 1819998181. The reversal of 1819998180 is 818999181.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1819998181) by changing a digit.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 49189122 + ... + 49189158.

It is an arithmetic number, because the mean of its divisors is an integer number (9248820).

Almost surely, 2^1819998180 is an apocalyptic number.

1819998180 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 1819998180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3995490240).

1819998180 is an abundant number, since it is smaller than the sum of its proper divisors (6170982300).

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

1819998180 is a wasteful number, since it uses less digits than its factorization.

1819998180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 54.

The square root of 1819998180 is about 42661.4366846687. The cubic root of 1819998180 is about 1220.9287427703.

It can be divided in two parts, 1819 and 998180, that added together give a palindrome (999999).

The spelling of 1819998180 in words is "one billion, eight hundred nineteen million, nine hundred ninety-eight thousand, one hundred eighty".