216404434 has 8 divisors (see below), whose sum is σ = 324987120. Its totient is φ = 108075396.

The previous prime is 216404431. The next prime is 216404443. The reversal of 216404434 is 434404612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (216404431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61264 + ... + 64699.

It is an arithmetic number, because the mean of its divisors is an integer number (40623390).

Almost surely, 2^216404434 is an apocalyptic number.

216404434 is a deficient number, since it is larger than the sum of its proper divisors (108582686).

216404434 is a wasteful number, since it uses less digits than its factorization.

216404434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126824.

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 216404434 is about 14710.6911462378. The cubic root of 216404434 is about 600.3742424484.

The spelling of 216404434 in words is "two hundred sixteen million, four hundred four thousand, four hundred thirty-four".