216439147 has 4 divisors (see below), whose sum is σ = 216478080. Its totient is φ = 216400216.

The previous prime is 216439133. The next prime is 216439193. The reversal of 216439147 is 741934612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216439147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216439247) 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, 9388 + ... + 22825.

It is an arithmetic number, because the mean of its divisors is an integer number (54119520).

Almost surely, 2^216439147 is an apocalyptic number.

216439147 is a deficient number, since it is larger than the sum of its proper divisors (38933).

216439147 is an equidigital number, since it uses as much as digits as its factorization.

216439147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38932.

The product of its digits is 36288, while the sum is 37.

The square root of 216439147 is about 14711.8709551165. The cubic root of 216439147 is about 600.4063423403.

The spelling of 216439147 in words is "two hundred sixteen million, four hundred thirty-nine thousand, one hundred forty-seven".