216340047 has 96 divisors (see below), whose sum is σ = 416332800. Its totient is φ = 107110080.

The previous prime is 216340031. The next prime is 216340049. The reversal of 216340047 is 740043612.

216340047 is a `hidden beast` number, since 21 + 634 + 0 + 0 + 4 + 7 = 666.

It is not a de Polignac number, because 216340047 - 2⁴ = 216340031 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216340047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216340049) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 780873 + ... + 781149.

It is an arithmetic number, because the mean of its divisors is an integer number (4336800).

Almost surely, 2^216340047 is an apocalyptic number.

216340047 is a deficient number, since it is larger than the sum of its proper divisors (199992753).

216340047 is a wasteful number, since it uses less digits than its factorization.

216340047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338 (or 321 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 216340047 is about 14708.5025410475. The cubic root of 216340047 is about 600.3146932514.

Adding to 216340047 its reverse (740043612), we get a palindrome (956383659).

The spelling of 216340047 in words is "two hundred sixteen million, three hundred forty thousand, forty-seven".