217103994 has 24 divisors (see below), whose sum is σ = 495150240. Its totient is φ = 68559048.

The previous prime is 217103989. The next prime is 217104023. The reversal of 217103994 is 499301712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 317062 + ... + 317745.

It is an arithmetic number, because the mean of its divisors is an integer number (20631260).

Almost surely, 2^217103994 is an apocalyptic number.

217103994 is an abundant number, since it is smaller than the sum of its proper divisors (278046246).

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

217103994 is a wasteful number, since it uses less digits than its factorization.

217103994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634834 (or 634831 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 217103994 is about 14734.4492262181. The cubic root of 217103994 is about 601.0204800501.

The spelling of 217103994 in words is "two hundred seventeen million, one hundred three thousand, nine hundred ninety-four".