217015238 has 16 divisors (see below), whose sum is σ = 363375936. Its totient is φ = 96348840.

The previous prime is 217015229. The next prime is 217015241. The reversal of 217015238 is 832510712.

It is a super-3 number, since 3×217015238³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 217015238.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 113756 + ... + 115647.

It is an arithmetic number, because the mean of its divisors is an integer number (22710996).

Almost surely, 2^217015238 is an apocalyptic number.

217015238 is a deficient number, since it is larger than the sum of its proper divisors (146360698).

217015238 is a wasteful number, since it uses less digits than its factorization.

217015238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229459.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 217015238 is about 14731.4370649981. The cubic root of 217015238 is about 600.9385662420.

The spelling of 217015238 in words is "two hundred seventeen million, fifteen thousand, two hundred thirty-eight".