217970343 has 6 divisors (see below), whose sum is σ = 314846064. Its totient is φ = 145313556.

The previous prime is 217970339. The next prime is 217970359. The reversal of 217970343 is 343079712.

It is not a de Polignac number, because 217970343 - 2² = 217970339 is a prime.

It is a super-2 number, since 2×217970343² = 95022140855075298, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 217970298 and 217970307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217970143) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12109455 + ... + 12109472.

It is an arithmetic number, because the mean of its divisors is an integer number (52474344).

Almost surely, 2^217970343 is an apocalyptic number.

217970343 is a deficient number, since it is larger than the sum of its proper divisors (96875721).

217970343 is a wasteful number, since it uses less digits than its factorization.

217970343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24218933 (or 24218930 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 36.

The square root of 217970343 is about 14763.8187133275. The cubic root of 217970343 is about 601.8188722678.

The spelling of 217970343 in words is "two hundred seventeen million, nine hundred seventy thousand, three hundred forty-three".