216447442 has 8 divisors (see below), whose sum is σ = 330797196. Its totient is φ = 106181712.

The previous prime is 216447437. The next prime is 216447443. The reversal of 216447442 is 244744612.

It can be written as a sum of positive squares in 2 ways, for example, as 206468161 + 9979281 = 14369^2 + 3159^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 216447398 and 216447407.

It is not an unprimeable number, because it can be changed into a prime (216447443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1020873 + ... + 1021084.

Almost surely, 2^216447442 is an apocalyptic number.

216447442 is a deficient number, since it is larger than the sum of its proper divisors (114349754).

216447442 is a wasteful number, since it uses less digits than its factorization.

216447442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2042012.

The product of its digits is 43008, while the sum is 34.

The square root of 216447442 is about 14712.1528676125. The cubic root of 216447442 is about 600.4140124053.

The spelling of 216447442 in words is "two hundred sixteen million, four hundred forty-seven thousand, four hundred forty-two".