217942 has 4 divisors (see below), whose sum is σ = 326916. Its totient is φ = 108970.
The previous prime is 217937. The next prime is 217969. The reversal of 217942 is 249712.
It is a semiprime because it is the product of two primes.
It is a congruent number.
It is an unprimeable number.
217942 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54484 + ... + 54487.
It is an arithmetic number, because the mean of its divisors is an integer number (81729).
2217942 is an apocalyptic number.
217942 is a deficient number, since it is larger than the sum of its proper divisors (108974).
217942 is a wasteful number, since it uses less digits than its factorization.
217942 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 108973.
The product of its digits is 1008, while the sum is 25.
The square root of 217942 is about 466.8425858895. The cubic root of 217942 is about 60.1792786010.
The spelling of 217942 in words is "two hundred seventeen thousand, nine hundred forty-two".
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