217429868 has 24 divisors (see below), whose sum is σ = 389188800. Its totient is φ = 106254608.

The previous prime is 217429867. The next prime is 217429897. The reversal of 217429868 is 868924712.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (217429867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39671 + ... + 44817.

It is an arithmetic number, because the mean of its divisors is an integer number (16216200).

Almost surely, 2^217429868 is an apocalyptic number.

It is an amenable number.

217429868 is a deficient number, since it is larger than the sum of its proper divisors (171758932).

217429868 is a wasteful number, since it uses less digits than its factorization.

217429868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5389 (or 5387 counting only the distinct ones).

The product of its digits is 387072, while the sum is 47.

The square root of 217429868 is about 14745.5033145702. The cubic root of 217429868 is about 601.3210411344.

The spelling of 217429868 in words is "two hundred seventeen million, four hundred twenty-nine thousand, eight hundred sixty-eight".