1230436818 has 72 divisors (see below), whose sum is σ = 2981704908. Its totient is φ = 378543456.

The previous prime is 1230436811. The next prime is 1230436877. The reversal of 1230436818 is 8186340321.

It can be written as a sum of positive squares in 2 ways, for example, as 1230115329 + 321489 = 35073^2 + 567^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1230436811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 166980 + ... + 174192.

Almost surely, 2^1230436818 is an apocalyptic number.

1230436818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1230436818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1490852454).

1230436818 is an abundant number, since it is smaller than the sum of its proper divisors (1751268090).

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

1230436818 is an frugal number, since it uses more digits than its factorization.

1230436818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7252 (or 7231 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 1230436818 is about 35077.5828414673. The cubic root of 1230436818 is about 1071.5680906770.

The spelling of 1230436818 in words is "one billion, two hundred thirty million, four hundred thirty-six thousand, eight hundred eighteen".