216825347 has 8 divisors (see below), whose sum is σ = 226709280. Its totient is φ = 206979520.

The previous prime is 216825331. The next prime is 216825391. The reversal of 216825347 is 743528612.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 216825347 - 2⁴ = 216825331 is a prime.

It is a super-2 number, since 2×216825347² = 94026462203340818, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216825347.

It is not an unprimeable number, because it can be changed into a prime (216825047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2447 + ... + 20967.

It is an arithmetic number, because the mean of its divisors is an integer number (28338660).

Almost surely, 2^216825347 is an apocalyptic number.

216825347 is a deficient number, since it is larger than the sum of its proper divisors (9883933).

216825347 is a wasteful number, since it uses less digits than its factorization.

216825347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19053.

The product of its digits is 80640, while the sum is 38.

The square root of 216825347 is about 14724.9905602686. The cubic root of 216825347 is about 600.7632388842.

The spelling of 216825347 in words is "two hundred sixteen million, eight hundred twenty-five thousand, three hundred forty-seven".