216446 has 4 divisors (see below), whose sum is σ = 324672. Its totient is φ = 108222.

The previous prime is 216431. The next prime is 216451. The reversal of 216446 is 644612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an Ulam number.

It is a Curzon number.

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, 54110 + ... + 54113.

It is an arithmetic number, because the mean of its divisors is an integer number (81168).

2²¹⁶⁴⁴⁶ is an apocalyptic number.

216446 is a deficient number, since it is larger than the sum of its proper divisors (108226).

216446 is a wasteful number, since it uses less digits than its factorization.

216446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108225.

The product of its digits is 1152, while the sum is 23.

The square root of 216446 is about 465.2375737191. The cubic root of 216446 is about 60.0412679058.

The spelling of 216446 in words is "two hundred sixteen thousand, four hundred forty-six".