217382397 has 16 divisors (see below), whose sum is σ = 292844160. Its totient is φ = 143429312.

The previous prime is 217382351. The next prime is 217382413. The reversal of 217382397 is 793283712.

It is a cyclic number.

It is not a de Polignac number, because 217382397 - 2¹⁴ = 217366013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217382597) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133963 + ... + 135575.

It is an arithmetic number, because the mean of its divisors is an integer number (18302760).

Almost surely, 2^217382397 is an apocalyptic number.

It is an amenable number.

217382397 is a deficient number, since it is larger than the sum of its proper divisors (75461763).

217382397 is a wasteful number, since it uses less digits than its factorization.

217382397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2052.

The product of its digits is 127008, while the sum is 42.

The square root of 217382397 is about 14743.8935495343. The cubic root of 217382397 is about 601.2772762351.

The spelling of 217382397 in words is "two hundred seventeen million, three hundred eighty-two thousand, three hundred ninety-seven".