243216429 has 16 divisors (see below), whose sum is σ = 334941120. Its totient is φ = 156867840.

The previous prime is 243216419. The next prime is 243216437. The reversal of 243216429 is 924612342.

It is a de Polignac number, because none of the positive numbers 2^k-243216429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243216429.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243216419) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13749 + ... + 25989.

It is an arithmetic number, because the mean of its divisors is an integer number (20933820).

Almost surely, 2^243216429 is an apocalyptic number.

It is an amenable number.

243216429 is a deficient number, since it is larger than the sum of its proper divisors (91724691).

243216429 is a wasteful number, since it uses less digits than its factorization.

243216429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12460.

The product of its digits is 20736, while the sum is 33.

The square root of 243216429 is about 15595.3976864971. The cubic root of 243216429 is about 624.2103555053.

The spelling of 243216429 in words is "two hundred forty-three million, two hundred sixteen thousand, four hundred twenty-nine".