243216404 has 6 divisors (see below), whose sum is σ = 425628714. Its totient is φ = 121608200.

The previous prime is 243216377. The next prime is 243216419. The reversal of 243216404 is 404612342.

243216404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 238764304 + 4452100 = 15452^2 + 2110^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30402047 + ... + 30402054.

It is an arithmetic number, because the mean of its divisors is an integer number (70938119).

Almost surely, 2^243216404 is an apocalyptic number.

It is an amenable number.

243216404 is a deficient number, since it is larger than the sum of its proper divisors (182412310).

243216404 is a wasteful number, since it uses less digits than its factorization.

243216404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60804105 (or 60804103 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 243216404 is about 15595.3968849786. The cubic root of 243216404 is about 624.2103341180.

Adding to 243216404 its reverse (404612342), we get a palindrome (647828746).

The spelling of 243216404 in words is "two hundred forty-three million, two hundred sixteen thousand, four hundred four".