217006939 has 8 divisors (see below), whose sum is σ = 223657280. Its totient is φ = 210429576.

The previous prime is 217006931. The next prime is 217006987. The reversal of 217006939 is 939600712.

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 217006939 - 2³ = 217006931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 217006898 and 217006907.

It is not an unprimeable number, because it can be changed into a prime (217006931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12177 + ... + 24130.

It is an arithmetic number, because the mean of its divisors is an integer number (27957160).

Almost surely, 2^217006939 is an apocalyptic number.

217006939 is a deficient number, since it is larger than the sum of its proper divisors (6650341).

217006939 is a wasteful number, since it uses less digits than its factorization.

217006939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36489.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 217006939 is about 14731.1553857802. The cubic root of 217006939 is about 600.9309058694.

The spelling of 217006939 in words is "two hundred seventeen million, six thousand, nine hundred thirty-nine".