1818211830 has 64 divisors (see below), whose sum is σ = 4537064448. Its totient is φ = 465949440.

The previous prime is 1818211771. The next prime is 1818211831. The reversal of 1818211830 is 381128181.

It is a junction number, because it is equal to n+sod(n) for n = 1818211791 and 1818211800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818211831) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71379 + ... + 93441.

It is an arithmetic number, because the mean of its divisors is an integer number (70891632).

Almost surely, 2^1818211830 is an apocalyptic number.

1818211830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1818211830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2268532224).

1818211830 is an abundant number, since it is smaller than the sum of its proper divisors (2718852618).

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

1818211830 is a wasteful number, since it uses less digits than its factorization.

1818211830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22181.

The product of its (nonzero) digits is 3072, while the sum is 33.

The square root of 1818211830 is about 42640.4951894323. The cubic root of 1818211830 is about 1220.5291599512.

The spelling of 1818211830 in words is "one billion, eight hundred eighteen million, two hundred eleven thousand, eight hundred thirty".