217493343 has 20 divisors (see below), whose sum is σ = 325316728. Its totient is φ = 144808560.

The previous prime is 217493333. The next prime is 217493347. The reversal of 217493343 is 343394712.

It is not a de Polignac number, because 217493343 - 2⁴ = 217493327 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 217493298 and 217493307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217493347) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 93705 + ... + 95997.

Almost surely, 2^217493343 is an apocalyptic number.

217493343 is a deficient number, since it is larger than the sum of its proper divisors (107823385).

217493343 is a wasteful number, since it uses less digits than its factorization.

217493343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3476 (or 3467 counting only the distinct ones).

The product of its digits is 54432, while the sum is 36.

The square root of 217493343 is about 14747.6555085885. The cubic root of 217493343 is about 601.3795506357.

The spelling of 217493343 in words is "two hundred seventeen million, four hundred ninety-three thousand, three hundred forty-three".