217396 has 24 divisors (see below), whose sum is σ = 423360. Its totient is φ = 97152.

The previous prime is 217387. The next prime is 217397. The reversal of 217396 is 693712.

It is a super-2 number, since 2×217396² = 94522041632, which contains 22 as substring.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217397) 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, 1495 + ... + 1633.

It is an arithmetic number, because the mean of its divisors is an integer number (17640).

2²¹⁷³⁹⁶ is an apocalyptic number.

It is an amenable number.

217396 is a deficient number, since it is larger than the sum of its proper divisors (205964).

217396 is a wasteful number, since it uses less digits than its factorization.

217396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183 (or 181 counting only the distinct ones).

The product of its digits is 2268, while the sum is 28.

The square root of 217396 is about 466.2574396189. The cubic root of 217396 is about 60.1289817889.

The spelling of 217396 in words is "two hundred seventeen thousand, three hundred ninety-six".