243986436 has 72 divisors (see below), whose sum is σ = 639411864. Its totient is φ = 78382080.

The previous prime is 243986423. The next prime is 243986437. The reversal of 243986436 is 634689342.

It can be written as a sum of positive squares in 4 ways, for example, as 43480836 + 200505600 = 6594^2 + 14160^2 .

It is a junction number, because it is equal to n+sod(n) for n = 243986391 and 243986400.

It is not an unprimeable number, because it can be changed into a prime (243986437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 149706 + ... + 151326.

Almost surely, 2^243986436 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243986436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (319705932).

243986436 is an abundant number, since it is smaller than the sum of its proper divisors (395425428).

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

243986436 is a wasteful number, since it uses less digits than its factorization.

243986436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1781 (or 1776 counting only the distinct ones).

The product of its digits is 746496, while the sum is 45.

The square root of 243986436 is about 15620.0651727194. The cubic root of 243986436 is about 624.8683976779.

The spelling of 243986436 in words is "two hundred forty-three million, nine hundred eighty-six thousand, four hundred thirty-six".