217493830 has 16 divisors (see below), whose sum is σ = 404118144. Its totient is φ = 84191040.

The previous prime is 217493813. The next prime is 217493831. The reversal of 217493830 is 38394712.

It is a self number, because there is not a number n which added to its sum of digits gives 217493830.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217493831) 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, 350487 + ... + 351106.

It is an arithmetic number, because the mean of its divisors is an integer number (25257384).

Almost surely, 2^217493830 is an apocalyptic number.

217493830 is a deficient number, since it is larger than the sum of its proper divisors (186624314).

217493830 is a wasteful number, since it uses less digits than its factorization.

217493830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701631.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 217493830 is about 14747.6720196782. The cubic root of 217493830 is about 601.3799994949.

The spelling of 217493830 in words is "two hundred seventeen million, four hundred ninety-three thousand, eight hundred thirty".