216450905 has 8 divisors (see below), whose sum is σ = 283353984. Its totient is φ = 157418800.

The previous prime is 216450889. The next prime is 216450929. The reversal of 216450905 is 509054612.

It is a happy number.

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

It is not a de Polignac number, because 216450905 - 2⁴ = 216450889 is a prime.

It is a super-3 number, since 3×216450905³ (a number of 26 digits) contains 333 as substring.

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, 1967681 + ... + 1967790.

It is an arithmetic number, because the mean of its divisors is an integer number (35419248).

Almost surely, 2^216450905 is an apocalyptic number.

It is an amenable number.

216450905 is a deficient number, since it is larger than the sum of its proper divisors (66903079).

216450905 is a wasteful number, since it uses less digits than its factorization.

216450905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3935487.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 216450905 is about 14712.2705589586. The cubic root of 216450905 is about 600.4172144492.

The spelling of 216450905 in words is "two hundred sixteen million, four hundred fifty thousand, nine hundred five".