216434305 has 8 divisors (see below), whose sum is σ = 260953344. Its totient is φ = 172326000.

The previous prime is 216434297. The next prime is 216434333. The reversal of 216434305 is 503434612.

216434305 = T₉₃₀₂ + T₉₃₀₃ + ... + T₉₃₀₆.

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

It is not a de Polignac number, because 216434305 - 2³ = 216434297 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101521 + ... + 103630.

It is an arithmetic number, because the mean of its divisors is an integer number (32619168).

Almost surely, 2^216434305 is an apocalyptic number.

It is an amenable number.

216434305 is a deficient number, since it is larger than the sum of its proper divisors (44519039).

216434305 is a wasteful number, since it uses less digits than its factorization.

216434305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205367.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 216434305 is about 14711.7063932095. The cubic root of 216434305 is about 600.4018650400.

Adding to 216434305 its reverse (503434612), we get a palindrome (719868917).

The spelling of 216434305 in words is "two hundred sixteen million, four hundred thirty-four thousand, three hundred five".