217917342 has 24 divisors (see below), whose sum is σ = 472584216. Its totient is φ = 72572976.

The previous prime is 217917331. The next prime is 217917347. The reversal of 217917342 is 243719712.

It is a junction number, because it is equal to n+sod(n) for n = 217917297 and 217917306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217917347) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17373 + ... + 27159.

It is an arithmetic number, because the mean of its divisors is an integer number (19691009).

Almost surely, 2^217917342 is an apocalyptic number.

217917342 is an abundant number, since it is smaller than the sum of its proper divisors (254666874).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

217917342 is a wasteful number, since it uses less digits than its factorization.

217917342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11032 (or 11029 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 217917342 is about 14762.0236417640. The cubic root of 217917342 is about 601.7700895033.

The spelling of 217917342 in words is "two hundred seventeen million, nine hundred seventeen thousand, three hundred forty-two".