216226405 has 8 divisors (see below), whose sum is σ = 260549784. Its totient is φ = 172262400.

The previous prime is 216226393. The next prime is 216226429. The reversal of 216226405 is 504622612.

It can be written as a sum of positive squares in 4 ways, for example, as 1252161 + 214974244 = 1119^2 + 14662^2 .

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

It is not a de Polignac number, because 216226405 - 2¹³ = 216218213 is a prime.

It is a Duffinian number.

It is a congruent 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, 88516 + ... + 90925.

It is an arithmetic number, because the mean of its divisors is an integer number (32568723).

Almost surely, 2^216226405 is an apocalyptic number.

It is an amenable number.

216226405 is a deficient number, since it is larger than the sum of its proper divisors (44323379).

216226405 is a wasteful number, since it uses less digits than its factorization.

216226405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179687.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 216226405 is about 14704.6388939001. The cubic root of 216226405 is about 600.2095610577.

The spelling of 216226405 in words is "two hundred sixteen million, two hundred twenty-six thousand, four hundred five".