243421536 has 24 divisors (see below), whose sum is σ = 638981784. Its totient is φ = 81140480.

The previous prime is 243421531. The next prime is 243421543. The reversal of 243421536 is 635124342.

243421536 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243421531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1267725 + ... + 1267916.

It is an arithmetic number, because the mean of its divisors is an integer number (26624241).

Almost surely, 2^243421536 is an apocalyptic number.

It is an amenable number.

243421536 is an abundant number, since it is smaller than the sum of its proper divisors (395560248).

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

243421536 is a wasteful number, since it uses less digits than its factorization.

243421536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2535654 (or 2535646 counting only the distinct ones).

The product of its digits is 17280, while the sum is 30.

The square root of 243421536 is about 15601.9721830287. The cubic root of 243421536 is about 624.3857739466.

Adding to 243421536 its reverse (635124342), we get a palindrome (878545878).

It can be divided in two parts, 24342 and 1536, that added together give a triangular number (25878 = T₂₂₇).

The spelling of 243421536 in words is "two hundred forty-three million, four hundred twenty-one thousand, five hundred thirty-six".