217143340 has 12 divisors (see below), whose sum is σ = 456001056. Its totient is φ = 86857328.

The previous prime is 217143323. The next prime is 217143349. The reversal of 217143340 is 43341712.

217143340 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (217143349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5428564 + ... + 5428603.

It is an arithmetic number, because the mean of its divisors is an integer number (38000088).

Almost surely, 2^217143340 is an apocalyptic number.

217143340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217143340 is an abundant number, since it is smaller than the sum of its proper divisors (238857716).

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

217143340 is a wasteful number, since it uses less digits than its factorization.

217143340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10857176 (or 10857174 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 217143340 is about 14735.7843360983. The cubic root of 217143340 is about 601.0567857286.

The spelling of 217143340 in words is "two hundred seventeen million, one hundred forty-three thousand, three hundred forty".